You were just one good move a way from a win.
If you simply avoid vague moves like M5, you will improve by enough to beat this guy next time.
Also, try to think in terms of light and heavy. Be willing to abandon stones, either permanently or temporarily. ( see
http://senseis.xmp.net/?Light and
http://senseis.xmp.net/?Heavy )
(;CA[utf-8]GM[1]FF[4]ST[2]RU[Japanese]AP[CGoban:3]SZ[19]OT[5x30 byo-yomi]DT[2013-07-20]PC[KGS]PB[mediocrity]BR[7k]PW[zac]WR[7k]KM[6.5]TM[1800]RE[B+4.5]MULTIGOGM[0];B[dq]BL[1794.93];W[dd]WL[1794.65];B[qp]BL[1793.42];W[pd]WL[1789.47];B[jc]BL[1791.24];W[co]WL[1782.5];B[bp]BL[1788.27](;W[bo]WL[1769.48]C[See also var.
JB: This is really an endgame move. This stone tries to accomplish something in a contested area, when there is a lot of uncontested board available.];B[cp]BL[1787.02]C[JB: Tewari analysis: consider this position as if D3 had been black's latest move. If there are two small walls running side by side, the first player to hane gains an advantage. So D3 is misplaced here, and would look better at D5.
Thus we can assume that black will realize this and play D5 soon. So you want to prevent that. See variations](;W[cl]WL[1739.75]C[See var.];B[do]BL[1783.08]C[JB: Ouch];W[dn]WL[1737.19](;B[eo]BL[1775.92]C[See var.](;W[jp]WL[1721.78]C[JB: This may be too close to strength. See variations];B[hp]BL[1770.29](;W[io]WL[1713.94]C[JB: Small and heavy. There is lots of uncontested space elsewhere on the board. See variations];B[oq]BL[1763.15];W[qj]WL[1708.27]C[JB: Good move!
];B[lq]BL[1760.72](;W[lo]WL[1700.79]C[JB: Now your group is getting too big to lose, but still has no eye space. See variations.];B[fd]BL[1751.66];W[df]WL[1679.98];B[dj]BL[1741.47](;W[cj]WL[1667.98]C[JB: Don't attach to weak stones. Doing so tends to encourage them to strengthen themselves. See variations];B[ci]BL[1735.49];W[bj]WL[1661.65]C[JB: He adds a friend to his weak stone WHILE THREATENING YOURS.];B[dh]BL[1723.09];W[dk]WL[1654.9];B[ej]BL[1720.67](;W[ec]WL[1648.81]C[JB: This encourages good shape by him. See variation.];B[fc]BL[1707.91];W[qm]WL[1638.55];B[ed]BL[1684.93];W[dc]WL[1634.62];B[en]BL[1668.48];W[dm]WL[1628.77];B[ao]BL[1667.02](;W[bn]WL[1626.44]C[JB: Empty triangles should reflexively lead you to look for other moves. See variation];B[an]BL[1664.43];W[am]WL[1623.46];B[ap]BL[1663.03];W[bm]WL[1621.11];B[bi]BL[1661.35];W[mc]WL[1600.79];B[qf]BL[1653.7];W[qe]WL[1598.12];B[pf]BL[1649.36](;W[ne]WL[1593.21]C[JB: Quit being greedy. Maintain good shape. You have time to do thing right, for he will not be able to fix his problem in one move. See variations];B[ri]BL[1643.6];W[rj]WL[1591.01];B[qi]BL[1642.69](;W[oj]WL[1588.02];B[pi]BL[1640.45](;W[pj]WL[1581.73];B[oi]BL[1635.77];W[ni]WL[1572.51];B[nh]BL[1633.61](;W[mi]WL[1569.28]C[Soft. See var.
JB:Yes, you are being way to easy on him.];B[mh]BL[1605.92];W[li]WL[1565.41];B[bf]BL[1601.09];W[ce]WL[1560.43];B[be]BL[1599.22];W[bd]WL[1558.54];B[cg]BL[1597.86](;W[eg]WL[1543.39];B[aj]BL[1589.79];W[ak]WL[1536.06];B[ai]BL[1586.65];W[bk]WL[1532.5];B[eh]BL[1581.12];W[lh]WL[1519.66];B[mf]BL[1568.08];W[nn]WL[1508.82];B[jq]BL[1553.01];W[kp]WL[1506.34];B[kq]BL[1551.96];W[ho]WL[1504.1];B[ip]BL[1550.63];W[gp]WL[1500.78];B[gq]BL[1549.14];W[hq]WL[1495.82];B[iq]BL[1547.82];W[fq]WL[1490.51];B[gr]BL[1544.67];W[fo]WL[1488.73];B[fr]BL[1541.02];W[eq]WL[1484.16];B[er]BL[1536.78];W[kl]WL[1379.88]C[z. shoulder be further out towards the center, if at all?e. yes.];B[gn]BL[1532.83];W[go]WL[1377.43];B[fn]BL[1531.71];W[lg]WL[1360.55];B[mg]BL[1527.29];W[ro]WL[1350.96];B[rp]BL[1525.3];W[re]WL[1346.9];B[rf]BL[1523.15];W[kb]WL[1345.01];B[jb]BL[1520.58];W[eb]WL[1343.54];B[fb]BL[1519.33];W[fa]WL[1318.74];B[ga]BL[1517.59];W[ea]WL[1315.85];B[hb]BL[1516.41];W[sf]WL[1311.14];B[sg]BL[1511.77];W[se]WL[1309.46];B[rh]BL[1510.41];W[sp]WL[1306.82];B[sq]BL[1508.67];W[so]WL[1305.2];B[rr]BL[1506.85];W[qo]WL[1302.31];B[po]BL[1504.91];W[pn]WL[1300.18];B[oo]BL[1503.88];W[on]WL[1297.85];B[sj]BL[1498.8];W[sk]WL[1295.85];B[si]BL[1497.83](;W[rk]WL[1286.53];B[hm]BL[1488.9];W[gg]WL[1270.41];B[ad]BL[1485.45];W[bc]WL[1268.12];B[ac]BL[1483.85];W[ab]WL[1266.4];B[ae]BL[1482.79];W[bb]WL[1264.26];B[fh]BL[1477.81];W[fg]WL[1261.77];B[lb]BL[1475.27];W[lc]WL[1256.03];B[kc]BL[1471.33];W[mb]WL[1254.12];B[ka]BL[1470.57];W[cf]WL[1248];B[bh]BL[1467.5];W[gh]WL[1232.15];B[jm]BL[1464.66];W[km]WL[1229.89];B[jn]BL[1463.18];W[jo]WL[1227.38];B[kn]BL[1462.08];W[ln]WL[1225.22];B[jl]BL[1459.16];W[kk]WL[1223.03];B[mp]BL[1457.72];W[no]WL[1217.32];B[np]BL[1454.91];W[ij]WL[1177.81];B[ma]BL[1451.65];W[na]WL[1175.57];B[nb]BL[1446.71];W[la]WL[1172.67];B[lp]BL[1444.77];W[ko]WL[1169.81];B[ma]BL[1443.59];W[pp]WL[1159.8];B[op]BL[1441.28];W[la]WL[1156.69];B[kb]BL[1428.15];W[ma]WL[1151.84];B[pe]BL[1424.35];W[qd]WL[1148.58];B[oe]BL[1423.1];W[od]WL[1146.52];B[lf]BL[1420.62];W[kf]WL[1142.46];B[jk]BL[1411.94];W[jj]WL[1140.26];B[mo]BL[1410.97];W[mn]WL[1137.62];B[je]BL[1405.09];W[jf]WL[1130.75];B[ke]BL[1402.21];W[ek]WL[1123.3];B[fk]BL[1399.75];W[gi]WL[1118.23];B[fi]BL[1396.61];W[gj]WL[1115.17];B[nf]BL[1391.64];W[nd]WL[1110.12];B[if]BL[1388.97];W[he]WL[1097.01];B[ie]BL[1384.4];W[jh]WL[1093.03];B[hf]BL[1378.29];W[gf]WL[1084.09];B[ge]BL[1375.84];W[fe]WL[1076.73];B[hd]BL[1371.71];W[ig]WL[1074.93];B[hg]BL[1369.48];W[hh]WL[1071.34];B[ee]BL[1366.89];W[ef]WL[1044.49];B[ld]BL[1362.94];W[fj]WL[1032.81];B[fl]BL[1354.85];W[ik]WL[1026.5];B[il]BL[1351.1];W[hl]WL[1021.04];B[hk]BL[1344.26];W[hj]WL[998.936];B[gl]BL[1334.55];W[em]WL[985.594];B[fm]BL[1330.47];W[el]WL[958.434];B[dp]BL[1321.27];W[fp]WL[955.478];B[me]BL[1315.04];W[md]WL[951.384];B[in]BL[1301.85];W[gk]WL[945.248];B[hl]BL[1295.05];W[ff]WL[937.652];B[dg]BL[1285.25];W[]WL[937.65];B[]BL[1285.25]TB[gd][id][jd][kd][he][le][af][of][ag][bg][ng][og][pg][rg][ah][ch][qg][oh][ph][qh][sh][di][ei][gm][im][pp][aq][bq][cq][hq][mq][nq][pq][qq][rq][ar][br][cr][dr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][sr][as][cs][ds][es][gb][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss][ha][ia][ja][bs][ib][gc][hc][ic]TW[aa][ba][ca][da][oa][pa][qa][ra][sa][cb][db][nb][ob][pb][qb][rb][cc][nc][oc][pc][qc][rc][sc][cd][rd][sd][jg][kg][ih][kh][hi][ii][ji][ki][kj][lj][mj][nj][ck][lk][mk][nk][ok][pk][qk][al][bl][dl][ll][ml][nl][ol][pl][rl][sl][cm][lm][mm][nm][om][pm][rm][sm][cn][qn][rn][sn][sb][ql]C[mediocrity [7k\]: gg byezac [8k\]: thanks]))(;W[ff]))(;W[mh]))(;W[ol]))(;W[pi]C[Z. hane?e. yes.]))(;W[nd])(;W[nc])(;W[od]))(;W[bm];B[an]C[JB: If you play better shape, and he continues with a premature yose move as he did in the game, you now can ignore his 3-point move...];W[mc]C[JB: ...and play something worth at least 10 points.
BTW, note the classic eye shape denoted by triangles.]TR[dm][dn][co][bo][bm]))(;W[ff]C[The C16 stone is an attacking stone. Use it before it gets squashed.]))(;W[bj]C[JB: Where will he get eyes now?])(;W[el]C[JB: Solid, and separates him from nearest friends])(;W[ek]C[JB: Like #3, but more aggressive , and not quite as solid.]))(;W[kq]C[Attaching to a strong stone cost you nothing. It interferes a bit with his territorial plans, and move toward the edge where an eye might be found.]))(;W[nq]C[JB: Make the beginnings of a living group while approaching the corner.])(;W[oq]C[JB: Same idea, just a bit more aggressive.])(;W[qj]C[JB: You could let the stone be light, and tenuki to the biggest open space.]))(;W[en];B[fo];W[gc]LB[do:a]C[Z. better?e. Go back and look at the result if you got (a) yourself.])(;W[nq])(;W[oq])(;W[hc])(;W[qj]))(;B[en]LB[do:a]C[B can double hane. Painful for W. This is why (a) was a vital point for both sides.]))(;W[do]C[Vital point.])(;W[eo]C[JB: Another way of controlling the vital point. More enterprising, but slightly riskier.];B[do];W[dn];B[dp];W[cm];B[en];W[em];B[fn];W[fo]C[JB: This gets tricky])(;W[ep]C[JB: The shape move, which may be too risky to be reasonable.](;B[dp];W[do];B[eo];W[fp]C[JB: More tewari analysis: note that D3 is almost useless here.])(;B[do];W[dp];B[dn];W[cm];B[eq];W[fp]C[JB: Again, a tricky position.])))(;W[cl]C[JB: You can support the C5 stone while expanding into bigger areass of the board.]))
then yes you are correct.