I feel like I'm an obligation to my fiance...

Like he's forced to stay in a relationship with me. He told me yesterday that if he had to choose between me and being with someone else, he'd stay with me because I was the "smart" choice, even if he was happier with someone else.

He doesn't kiss me anymore. He doesn't want to hold my hand. He refuses to cuddle. He doesn't want sex. We don't talk or hang out together amymore...it's like we're cohabitating. We're not a couple.

And I keep trying, only to be pushed away. This is all new....He's never done this before with me...It hurts.

Any idea what would all of a sudden make a guy not want his fiance anymore?