My marriage is falling apart

How do you all fix your marriages? All me and my husband do is fight, the only time we don’t fight is when we’re asleep. He has touched me since dec 30th. He won’t let me touch him, whenever I do he says “get off of me” or “my god stop touching me there, that’s all you wanna do”. And he yells at me and gets so defensive. He does work a lot some days is 21 hours shifts and other days it’s 13-15 hours so I know he’s tired from working all the time, but he also comes home and play his PlayStation4 for 5-6 hours after he gets off work.. but yet he’s “too tired to touch me or do anything”. I feel like there’s someone else but when I confront him he says “for once I wish you were right but there really is no one”.