Boyfriend Issues

So I like this guy, a lot. I'm actually in love with him. At first I was really sexually attracted to him, and it's just been dwindling for a while. I'm sexually attracted to other people but not necessarily him anymore. I do NOT want to cheat, but I want dick... just not necessarily his... I feel like the worst girlfriend. I do not plan on cheating but I feel bad for wanting other people sexually, more than I want him... anyway Advice?