I figured this out by ear last night while I was listening to it for the first time in a 
few months. I think the original is by Paul Collins, but The Exploding Hearts covered 
it a few years ago and that's the version I know best.

Intro:
E (022100@1)              D (xx0232@1)             AE                D (xx0232@1)             A (x02220@1)Chorus:
E (022100@1)             D (xx0232@1)             AOh (x02220@1)why are you walking out on love?
E (022100@1)             D (xx0232@1)             AOh (x02220@1)why are you walking out on love?

Verse 1:
EmWhy (022000@1)are you leaving,
You're saying goodbye,
Why don't you stay,
And give it one more try?

D (xx0232@1)                               BWhy (x2444x@1)when you were happy here with me?

Chorus:
E (022100@1)             D (xx0232@1)             AOh (x02220@1)why are you walking out on love?
Oh why are you walking out on love?

Verse 2:
EmGimme (022000@1)the reason,
The truth of my lies.
You're saying you love me,
Now you're saying good bye.

D (xx0232@1)                               BWhy (x2444x@1)when you were happy here with me?

Chorus:
E (022100@1)             D (xx0232@1)            AOh (x02220@1)why are you walking out on love?
Oh why are you walking out on love?

Verse 3:
EmWhy (022000@1)are you leaving,
You're saying goodbye.
Why don't you stay,
And give it one more try?

D (xx0232@1)                               BWhy (x2444x@1)when you were happy here with me?

Chorus:
E (022100@1)             D (xx0232@1)             AOh (x02220@1)why are you walking out on love?
Oh why are you walking out on love?

Outro:
D (xx0232@1)             AWalking (x02220@1)out on love.
D (xx0232@1)             AWalking (x02220@1)out on love.
D (xx0232@1)             AWalking (x02220@1)out on love.

I hope you have a killer time playing this, and I hope this tab helped you.
Stay groovy and keep on rockin'!