I just need to vent. Tell me if im being neurotic and over reacting... Am I making the right choice?

I am finally seriuly thinking about leaving my live in boyfriend of 4 years. Tonight was the last straw. He told me yesterday that he might go out with one of the reps at his company at some big bar for this guys b-day... he wanted to "role solo", in his words.. cool with me, we see each other every day. But he told me today he does not really want to go, and he probably won't. I go to work out, and im gone for 30 minutes and he is gone. No note, no nothing! I call him and he tells me he woke up from his nap and just decided he was bored and he wanted to go to the bar. Fine by me.. although I was a little ticked at the fact that he could not even tell me goodbye, he knew where I was! At the apartment complex gym! He told me he will be home in and hour or 2 (at 6pm). He has a problem with liquor, so now all he does is beer, but he drank liquor for the first time last night in a while... maybe opened up pandoras box? because normally when he is just doing beer he is home soon, but it is now almost midnight and no sign of him. Not even a phone call, or a text message. I have called him numerous times becuase I am worried about him drinking and driving, but he does not answer and does not call me back. I text him and told him that I am pretty much done. I have been dealing with this crap for a while. I have gained a little weight that I am trying to work off, and he is on this kick that I need to weigh 118 lbs, and I am 5'8! I want to be at 130, but he disagrees. I work part time because I am a full time student trying to get accepted into nursing school, and a lot of the times he tells me whenever we have an argument that I bring nothing to the table because I make less than him. He also tells me that he can do better than me and that when he goes out alone, he has attractive, successful girls hitting on him all the time and he wonders why he is with me. Never appologies because somehow I brought it on myself... That is why I am so pissed that he is not answering his phone now! I have no trust in him. I am not even attracted to him. When he wants to be intimate, he will say stuff like "put ur lips around my ", or "i wanna tare that up"... just stuff that is not even romantic. It is hard to even lay in the bed with him without him trying to grope me and say "Oooh, I love your ****!!! Wanna ****?"!!!!!! Ugh! I live 8 hours away from my family so the only thing that is holding me back is the drive, and the fact that I have 2 lovely cats that I cannot take with me. We can't even really sit down and talk without having an argument. I feel like I have to agree with everything he says or I will get made to feel like ****. I am just an angry ***** right now! Also, I recently cosigned on a truck for him becuase his credit is ****. And now that is hanging over my head. He is not physically abusive, just not mentally attached to me it seems. Whenever I have a bad day at work, and want to talk about it, there are times where he will say stuff like "Your day does not compare with mine.. I have real problems, you work part time, how big can your problems be?" He does not like my family really because they don't have much money, therefor he does not think they are worth **** to him because they aren't in the position to help us out, and in his eyes becuase I am the one bringing him down, they should send lots of money. I go to school 14 credit hours. I did work a full time job that allowed me to do my homework on the job, but because I was not busy enough at my job he basically made me feel so bad about it that I quit. The economy is so bad that the only thing I have been able to find is part time, so I filled the rest of my time with cles, so now I am stuck until May when the cles are over. Then sometimes he will say "Just work on getting your ursgin degree, that is how you can help us out the most"... My head is just spinning right now. I am at a crossroads. I don't know what to say to reach him, and make him feel as if my opinions and feelings matter...