Why do my feelings change when it seems like I should like him even more?

BallerinaGirl
I have a really great awesome boyfriend, but I keep finding myself attracted to this one other guy.

My boy friend is really nice, really good, wouldn't do anything I wouldn't want him to, and is always open and truthful to me. I REALLY want to love him. And sometimes I do. But my feelings keep changing. He is completely crazy about me and tells me often how much he loves me. And I always feel really bad because my feelings for him change. Sometimes the relationship feels more like a trap then anything else.

I really want to love him, why can't I? Why do my feelings always change? It seems like now the relationship is getting serious, I'm getting less attracted, BUT I really want to be attracted. What should I do? I don't want to hurt his feelings, he is crazy about me.
Why do my feelings change when it seems like I should like him even more?
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