usually a very sexual person, can't stand the sight of a penis right now....

Okay so I gained a lot of weight recently and I feel gross so maybe THATS why I feel this way but DAMN. My boyfriend has got to hate me right about now. I'm just not feelin' it AT ALL. Like not for the past few months. We used to have sex EVERY. SINGLE. DAY. sometimes more than once. For four years straight. I can't even stand to think about him inside of me. I don't want to touch him. Wanna get me off? Fine. Im down. But anything else. No. Way. And I've always been the type that gets off to him getting off. I'm just so confused why I'm being like this right now. Help?