Is there something mentally wrong with my husband or is he just an alcoholic?

My husband and I have been married for 13 yrs. He has been a heavy drinker off and on throughout our marriage. More on than off. I have had it! He drinks at home BUT he does stupid things while he is drunk. For example, he has picked up prostitutes several times while intoxicated. He claims that he only did drugs with them, as if that is suppose to make it ok. During those binges he would spend his whole check plus some, leaving us broke. He hasn't done the prostitute thing or disappearing all night thing in about 4 years. YES, I kicked him out for those acts and he couldn't come home til he had been tested for all types of STD's. He even on one occassion while I was at work and he was suppose to be watching our 2 daughters, whom at the time were only 3 yrs and 1 yr old, he took them and picked up 2 prostitutes while he had our 2 daughters in the vehicle. My 3 yr old told me about it. That was about 9 years ago. He now drinks at home every night. 6 pack plus. Mostly he will clear a 12 pack. He will sit out back on our patio by himself while the kids and I are in the house and drink like a fish. It's not like he drinks a couple drinks to relax after work, he drinks til he is drunk. The kind of can't walk straight, running into things drunk. I am not a drinker or partier, and when he's in his drunken stupor it disgusts me and makes my stomach turn! My daughters are now 9 and 12 and they hate his drinking. They have lost alot of respect for him, his drinking, and his actions. We walk on egg shells while he's intoxicated due to the fact that if we say something he don't like he tends to throw a fit. Hits walls, curses at me, the list goes on. Here lately he has become very possessive and clingy to me. Wants to be right next to me, don't want me to go anywhere without him, etc. He's driving me crazy. He constantly wants to touch me inappropriately while the girls are in the same room. He will try to hide it from them by getting a blanket and trying to touch under the blanket. It pisses me off because our daughters are in the same room, and I do not want them witnessing this. Then there's everytime the kids are outside or not home he wants to whip his penis out and try to shove it in my face, just very disrespectful. He has developed a foot fetish suddenly. I don't know where it comes from all a sudden, but he wants to constantly rub and suck on my feet. He has never been into that before. BUT here is the BIG kicker. My 2 daughters had a friend stay the night night before last. We had taken the kids to a festival here in town. He got so drunk he couldn't walk straight. Well we got home and he wanted to go to "bed".. I couldn't just run to the bedroom, the girls had company and I had to get a couple things done before bed. He of course got ticked. About an hour or so later, I seen him out of the corner of my eye look around the corner into the livingroom where the girls, their friend and I were at watching a movie. I figured he went back to bed and passed out. NOPE... about 15 minutes later I see him walk into the kitchen, coming towards the livingroom, NO CLOTHES ON FROM THE WASTE DOWN. He only had his t-shirt on and had his hands over his penis area. My daughters and their friend hurried up and pulled a blanket over there heads. They didn't see his penis because he had his hands over it. BUT I WAS PISSED!! I went to the bedroom and flipped out on him. That was unacceptable. I can't help but think he knew what he was doing cause he walked in with his hands over his private area. He was totally trashed, but that is not an excuse in my eyes. I feel there is NO excuse for that! I have not talked to him except to tell him how disgusting and wrong he is. I did tell him he was not drinking in this house anymore and I think we are going to seperate. He refuses to give up the alcohol and he refuses to leave the house. He also has stated he don't want anyone here. Not my family not his family..nobody! And he also made the comment that when people are here I pay attention to them, or I pay attention to my 2 daughters and don't give him any attention. That makes me feel that he has some jealousy towards our children. Why would he be jealous? I don't get it?! I personnally feel like he is mentally losing it.. but then I always second guess whether or not I am looking into it wrong or to much!! Probably because I have lived with an alcoholic to long. He says he don't have a drinking problem but obviously that's denial. Any thoughts? I want to leave him if he won't leave the house, but then I feel like it's my obligation to get him through this and get him help (which he refuses he needs any). Am I wrong for wanting to leave him? Does it seem as though he is mentally unstable based on his actions. Coming out naked from waist down in front of my daughters and their friend, I DON'T think I can ever forgive that. Does it seem