I think it's about a guy who gets involved with a girl who's got a boyfriend or husband and has no intention of leaving him, and he realises and feels like an idiot with a broken heart - and he knows she'll do it again to someone else:
But it wasn't you
And it wasn't him.
It was me who fell like a fool right in,
And I won't be the only one,
It could have been anyone!
I think it's about a guy who gets involved with a girl who's got a boyfriend or husband and has no intention of leaving him, and he realises and feels like an idiot with a broken heart - and he knows she'll do it again to someone else:
But it wasn't you And it wasn't him. It was me who fell like a fool right in, And I won't be the only one, It could have been anyone!