Need help on what to do with a fat, lazy, slob of a husband that is turning me out of this marriage of 15 yrs.

My husband comes home from work and sits on the couch everynight either playing games on his computer or watching TV. He's even go to the point where he will call the kids from another room to get him a beer, or soda or whatever from the kitchen that less than 10 feet away. He has gained so much weight that I am not attracted to him anymore which is causing problems elsewhere in the marriage. If I want anything done around the house I have to do it myself and take care of both of the kids with dropping them off and picking them up from practices. I ask him to do things and they never get done but the fans turned when he asked me to do something for him, you would think the world is coming to an end. The never finishes projects he starts in the house. He throws his clothes all over the place, not even close to the hamper. My kids think this is acceptable since they see him doing this. He dresses like a bum, grooming, huh,and I couldn't tell you the last time he brushed, he chews.