I Think I'm Leaving My Husband of 2 Yrs

Here goes: I am 25 (going on 26), and i've been married for 2 years and 3 months. I married a co-worker after knowing him for about 5 1/2 months, and dating him for 3. I was a virgin, and he was my first. We were both so messed up when we got together, emotionally speaking. He was in foster care part of his life, and was homeless for a few years. His mother and maternal grandparents died violent deaths, and his father has multiple sclerosis. I was almost two years about of college, living with my sister, and had no direction. I was seeing several men. I had an absentee father (who ran out on us once, only to return 2 weeks later), an overbearing mother, and grew up poor with 6 siblings. Yet we thought we saw something so beautiful and magical in each other. The first few months were spent talking for hours, kissing (among other things), and just enjoying each other and supporting each other. He didn't have much money, so I paid for a lot of things. So I was always so moved when he did get me something, even if it was only a pint of ice cream or some dopey little stuffed animal. Then he got a great job that paid really well, but had a very demanding schedule. I understood that it was very important to him to earn well and save well, because of how he had grown up. I tried to be as helpful as I could, preparing lunches, making dinner, doing laundry. We got married in june 2003, and got our own place in december. The first year of marriage was rocky; he had other commitments outside of work, and I saw him only a few hours a day. Sometimes, I went almost two days without seeing him. I let him know it was ok, but I just wanted him to call me and let me know how he was doing. I would think he would want to call me to see how I was doing. Things would get better, then worse. I didn't feel (and still don't) that I was his top priority. He used to tell me I was his family and only friend. I know I should have seen that as a warning sign, but I thought it was sweet. And even though I was close with most of my family, I started declining their invitations to go out and do things, to spend more time at home in the off-chance that I would see him. And that's the sum of our relationship. I have to schedule dates with him, and more than half the time, he breaks them, either to do one of his political activities, or because he's tired from work and his political activities. At first I thought I was being unfair to expect him to stay up or get up early to spend time with me, but now I realize I was wrong. It isn't too much to ask that we see each other more than once a week, or to be at the top of his list. Now my days are spent going to work, taking care of our two dogs (which he pushed for), doing housework and laundry, and cooking his meals for the week. I rarely see my family, because I can't depend on him for a ride home. I just think there has to be more out there for me. I know that my aimlessness as far as a career is not his fault, but when I do propose potential paths for myself, he shoots holes in those ideas, or complains that he won't get to see me. Or worse, asks me who's going to take care of the dogs. I've tried talking to him, but those talks devolve into shouting matches and personal attacks that are way off subject. To compound things, I think he's cheating on me. He went out of town two days ago (for an activist thing), and has called me once. From a pay phone. He has a cell phone, but lost the charger a while ago (he's been using his car charger). Even though he had plenty of time to purchase one before he left, he didn't. I even offered to let him take my phone, but he assured me his would work, and besides, he needed the phone numbers in his phone's contacts list. So he called me last night, but didn't tell me where he was staying or with whom. It's now been more than 24 hours, and I haven't heard from him. I don't know what to do. I think I have to leave him-- :(