Does he love me or is it just cause his use to been with me?

just his excuse to have an affair...that you've gained weight...maybe you should consider shedding a few pounds just to see if that's the real reason he's ignoring you, doesnt sound as if he is treating you respectfully, suggest that he should show you more respect and consideration if he wants to maintain a prosperous marriage, if he doesnt change for the sake of the marriage, then start divorce procedures