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Chord diagram for Am
Chord diagram for F
Chord diagram for C
      Tabbed by ear - Sounds fine to me.

Capo 2

Single strum through the verse.

                  Am
   Our love was lost
F                    C
   But now we've found it
                  Am
   Our love was lost
F                    C
   And hope was gone

                  Am
   Our love was lost
F                    C
   But now we've found it
                           Am
   And if you flash your heart
F              C
   I won't deny it

   I promise

Am F C (Strumming)
   I promise




That is basically it. It sounds like a 3 chord bash through most of it to me. 
Try it for yourselves.
If you find anything better feel free to correct me.
    

Source: https://tabs.ultimate-guitar.com/tab/the_temper_trap/love_lost_chords_1161599

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