There is basicly 4 chords running in this song.

C# (x43121@1)        Ab/Ab       C (x32010@1)        FmAnd (133111@1)if you want me girl, I will be your man
C# (x43121@1)        Ab/Ab       C (x32010@1)        FmAnd (133111@1)if you want me girl, I will be here forever
C# (x43121@1)        Ab/Ab       C (x32010@1)        FmAnd (133111@1)if you want me girl, I will be your man
C# (x43121@1)        Ab/Ab       C (x32010@1)        FmAnd (133111@1)if you want me girl, I will be here forever

And it just goes like that all the way.

For piano players, Best played with an Harpsichord effect

C# = Normal chord (C#-F-G#)
Ab/G# = Second inversion (D#-G#-C)
C = Normal Chord (C-E-G)
Fm = Second Inversion (C-F-G#)

You can add an F note right after de Fm Chord