The Killers - Somebody Told Me - What is it about

What is this song about? It seems the lead singer meet a woman who has boyfriend that looks like the singers old girlfriend. But ws the old girlfriend really a man or something?

He’s scoping a girl in the club then hears that she’s the lesbian that his girlfriend left him for.
If you want to get more literal his grilfriend turned butch or perhaps is even a FTM.

It’s confusing language but I think once you looks at it, it becomes clear.