I Don't Know If It Will Be Forever.

I'm starting to feel really guilty. My boyfriend and I have been together for five months, and after a month, we started having sexual intercourse. We have done is four times since because of our lack of privacy, and I don't feel aroused by him anymore. S** with him just doesn't appeal to me as it does with other men, and I don't know what to do. I do love him, and we promised to be with each other forever, but I want to have s** with other people. I feel stuck, and most of all, I feel like a traitor.