This is probably my favorite song... I can relate to it. Anyways, I made this
totally by ear so I hope y'all like it. First tab :)

       cadd9
Should've kissed you there
           DI (xx0232@1)should've held your face
           EmI (022000@1)should've watched those eyes
          DInstead (xx0232@1)of run in place

         GI (320003@1)should've called you out
         DI (xx0232@1)should've said your name
         EmI (022000@1)should've turned around
         DI (xx0232@1)should've looked again

    G (320003@1)      D (xx0232@1)           Em (022000@1)    CBut (x32010@1)oh, I'm staring at the mess I made
(G)     D (xx0232@1)           Em (022000@1)   C (x32010@1) I'm staring at the mess I made
(G)     D (xx0232@1)           Em (022000@1)  C(or alternative Bm)
  I'm staring at the mess I made
        Em (022000@1)      D (xx0232@1)                 CAs (x32010@1)you turn, you take your heart and walk away

     cadd9 
Should've held my ground
          DI (xx0232@1)could've been redeemed
            EmFor (022000@1)every second chance
            DThat (xx0232@1)changed its mind on me

           GI (320003@1)should've spoken up
           DI (xx0232@1)should've proudly claimed
          EmThat (022000@1)oh my head's to blame
          DFor (xx0232@1)all my hearts mistakes

    G (320003@1)       D (xx0232@1)          Em (022000@1)    CBut (x32010@1)oh, I'm staring at the mess I made
(G)      D (xx0232@1)          Em (022000@1)    C (x32010@1)  I'm staring at the mess I made
(G)      D (xx0232@1)          Em (022000@1)    C(alternative Bm)
   I'm staring at the mess I made
        Em (022000@1)      D (xx0232@1)                CAs (x32010@1)you turn, you take your heart and walk away

C D C

        G (320003@1)DAnd (xx0232@1)it's you
        Emcadd9 (022000@1)And it's you
        G (320003@1)DAnd (xx0232@1)it's you
        Emcadd9 (022000@1)And it's you


          G (320003@1)     DAnd (xx0232@1)it's falling down
        Em (022000@1)   CAs (x32010@1)you walk away
         G (320003@1)    cadd9
And it's on me now
       Em (022000@1)name="chord_x32010@1">C
As you go

           
(Repeat Chorus)

          G (320003@1)     DAnd (xx0232@1)it's falling down
        Em (022000@1)   CAs (x32010@1)you walk away
         G (320003@1)    cadd9
And it's on me now
       Em (022000@1)name="chord_x32010@1">C
As you go

(Repeat Chorus)