Why won't my husband have with me anymore?

I am 31 yrs old and have been married less than a year. Since i've been married I have become more fit and have lost 20 lbs. My husband on the other hand has become more lazy and has gained a little weight. Not enough that it would effect me wanting him ually. I have found that he tends to reject me more when initiating intimacy. I don't understand!!! I hve asked him why he doesn't want to have , and all he can tell me is that he is tired or he has a headache. Wait a minute!! Did I just wake up in another life? I am not unattractive by far. I feel more confident in my appearance. He says that I complain about my stomach and how I need to lose it. He says that makes him skeptical of me or looking at me. I have tried to lessen those comments. I have tried to encourage him to exercise and eat better but he refuses. He used to body build alot and I tried to encourage that. Walking in front of the tv naked isn't working either. Somethin's gotta give!! Help Yahoo!!