NO capo
I would play the Fm barred on the first fret then on the 8th in the pre chorus an 
at the end of the main chorus.

Verse / Chorus  Fm , Ab , Eb, C# .

Pre Chorus   C#, Eb, Fm, Eb
[VERSE 1]
FmI (133111@1)remember years ago
Ab (xx1114@1)Someone told me I should take
EbCaution (x43121@3)when it comes to love
C#I (x43121@1)did, I did
FmAnd (133111@1)you were strong and I was not
AbMy (xx1114@1)illusion, my mistake
EbI (x43121@3)was careless, I forgot
C#I (x43121@1)did

[PRE-CHORUS]
     C#And (x43121@1)now when all is done
                     EbThere (x43121@3)is nothing to say
                                FmYou (133111@1)have gone and so effortlessly

You have won
                  EbYou (x43121@3)can go ahead tell them

[CHORUS]
                 FmTell (133111@1)them all I know now
                   AbShout (xx1114@1)it from the rooftops
                  EbWrite (x43121@3)it on the skyline
               C#All (x43121@1)we had is gone now
                 FmTell (133111@1)them I was happy
                AbAnd (xx1114@1)my heart is broken
                  EbAll (x43121@3)my scars are open
                  C#Tell (x43121@1)them what I hoped would be
        Fm (133111@1)        AbImpossible, (xx1114@1)impossible
        Eb (x43121@3)          C#Impossible, (x43121@1)impossible

(repeat chord progressions throughout)

[VERSE 2]
Falling out of love is hard
Falling for betrayal is worst
Broken trust and broken hearts
I know, I know
Thinking all you need is there
Building faith on love is worst
Empty promises will wear
I know (i know)

[PRE-CHORUS]
And know when all is gone
There is nothing to say
And if you're done with embarrassing me
On your own you can go ahead tell them

[CHORUS]
Tell them all I know now
Shout it from the rooftops
Write it on the skyline
All we had is gone now
Tell them I was happy
And my heart is broken
All my scars are open
Tell them what I hoped would be
Impossible, impossible
Impossible, impossible
Impossible, impossible
Impossible, impossible
Impossible, impossible

I remember years ago
Someone told me I should take
Caution when it comes to love
I did

Tell them all I know now
Shout it from the rooftops
Write it on the skyline
All we had is gone now
Tell them I was happy (i was happy)
And my heart is broken
All my scars are open
Tell them what I hoped would be
Impossible, impossible
Impossible, impossible
Impossible, impossible
Impossible, impossible
Impossible, impossible

I remember years ago
Someone told me I should take
Caution when it comes to love
I did