@ehBeth,
well, not to him in this case...
hopes are hopes, but she took advantage of him in this case. for her it maybe was only sex, for him it was a loving experience, that left him even more in love with her... She told him she didn't want anything to do with him, so why have sex with him?? She could get it from anyone else then, not from her friend who she knows is not in good shape (mentally I mean)....
What did she think would be the outcome of this? All of the sudden after having sex with the girl he loves, he would fall completely out of love?
I think not