I'm a back stabbing b****... according to her

Oi. I feel totally slutty for this.

So, my friend Alex introduced me to Jack, her stepbrother. Only thing, she likes him. A lot. I find it completely wrong, especially sense he told her and me he will never like her more than a friend. Yet, she keeps bothering him to like her. She tells me how she has dreams about having sex with him and stuff.

Anyway, she introduced us and she knows that both Jack and I are big flirts. Jack and I got close right away. We like the same music, movies, sports- though I' don't play, I watch- pretty much everything. Another problem, he has a girlfriend.

He told me that he wants to break up with his girlfriend for me. I don't want him to do that, but -being the selfish person I am- I want him to. I told him to do what he wants, but I don't really know what I'd do... I really, really like him.

I don't know what to do. =/