Open Question: should I stay with him or should I go?

last year 0ct 2009 I found out that my bf was talking to his ex now ok that wouldnt be a big deal if I wasn’t pregnant and if she hadn’t been an issue in our lives before where she was disrespectful to me. We live states away from her but the emotional comfort he was trying to seek is what hurts me…I WAS PREGNANT with his kid and he’s thinking of her?? He went out of his way to email her and block his number just so they could talk, then he was looking up another ex online and staring at pics. what the heck?! He says I was the worst and so mean but hey you’d be too if that was happening to you, he ruined our relationship, trust, and pregnancy. He when confronted was hostile and said it wasn’t my business and i asked for it by looking for it – there shouldnt be anything to find!!! I have tried to forgive and move on but it’s hard and he never told me what they discussed and he said that he was looking at the other exes pics bc he missed her family?? lol like i’m not an idiot ok wtf kind of answer is that, then he tried to take it back. He isn’t very nice, he doesn’t allow me to heal and move forward bc whenever he gets mad he says oh i never had to deal with this in my past they never were like this or did this to me and that makes me go off on him i say yea they cheated instead and of course u didint have these issues with them bc they are our issue hello!!! I have been 100% faithful and devoted I do so much for him and he just doesn’t see it and always calls me a skank or hoe or implys i’m cheating and i’m not i’m not any of those things. Then he says oh it’s just what i’m usto, it’s like ok we’ve been together for years now those excuses are old don’t you think? We have 2 kids and i’m a stay at home mom with nothing so I feel like if I leave what would I do, How would I survive in the beginning? I have no where to go. When we’re good, we’re great but the past is hard to shake and I don’t know why. Although he didn’t physically cheat, emotionally my heart feels as if he did and it’s crushed and lost trust in him, he doesn’t get it. How can I better communicate with him where neither of us feels attacked and am I just being too resentful over it all? I don’t know what to do. please I need some advice.
I just want to add that I would never try and get even it’ not my style and we have been through a lot and always made ity through but I just feel like yes he was freaking out maybe and scared but that was not a good move. He admitted that he was trying to hurt me because he was mad but i’m so over the immaturity we are too old for this crap. His last relationship was when he was in h.s and then with a young woman fresh out of h.s. so my levels of how to be in a relationship and his are so different. He has grown yes, but he still gets like a kid when I confron him or put my foot down, I just wish there was a way to make him understand without him getting so mad! and as far as not working now I can and will get a night time job and he will watch the kids if we do decide this isn’t going to work. I just want to find a way to heal from this I need true, soulful advice. I considerd speaking with a counselour just to vent and release my resentments.