Chords:G C Bb De -3--0--1---0--- B -3--1--3---3--- G -0--0--3---2--- D -0--2--3---0--- A -2--3--1------- E -3-----1-------Intro: G G-Bb-G C-Bb (x2)C Bb GBeen a long time comingAnd the cards were stackedC GIt's been a long hard road to hell and backYour love meant troubleC GYou won every hand, I lost every betCNow you think that IGShould've Known BetterCNow I think that IGShould've seen it comeC BbMy heart sankGWhen I read that letterC DSank like a stone, sank like a stoneGCup of cold coffeeYesterday's mailCA bad love like this is alwaysGBound to failG G Bb GYour love meant trouble from the day we metC Bb CIf you want your thingsGThey're on the front stepCNow you think that IGShould've Known BetterCNow I think that IGShould've seen it comeC BbMy heart sankGWhen I read that letterC DSank like a stone, sank like a stone.Mandolin Solo (use chords from verse)GAll alone in my kitchenAll alnoe in my headCSome things you can't take backGOnce they've been saidGI don't know whatThis love is forCAll I know is IGDon't want it anymoreCNow you think that IG DShould've Known BetterCNow I think that IGShould've seen it comeC BbMy heart sankGWhen I read that letterC DSank like a stone, sank like a stone.I did this from a live show. It's pretty darn accurate.
Source: http://www.azchords.com/n/nickelcreek-tabs-2761/ishouldveknownbetter-tabs-581638.html