I need some advice, my husband wont forgive me and keeps telling me he is getting a divorce what should I do?

I got married to my high school sweetheart about 2 years ago, I relocated with him soon after due to his military career. A week later we got into a very heated debate, I don't even remember what it was about, he kicked me out that night saying it was his house and i spent the night in a parking lot. I was very angry. I was new to the area no friends no family with driving distance. I went back in the morning and he pretended like nothing happened. Weekend after weekend he went out with his military friends and left me home claiming it was not his fault he had friends and i didn't. He left for a month over seas and I met a guy who became my close friend and later I cheated on my husband. I felt horrible so I ended that fling before he got home and told him about it hoping he would forgive me. It got worse, each month was more drama then I found out I was a few weeks pregnant. He promised me our life would change for the better. It never did. MY son is now 3 months old and he hasn't even seen him. He is in Kuwait on deployment and didn't care to come home to see the birth. We are still married but all he does is throw it in my face that I was his biggest mistake. He will be back in Dec. and has said he doesn't care to meet his son and plans to divorce me. Other days he promises change and a new start, sends flowers, calls me daily and then he changes his mind. I love this man, but hate his actions, I'm going insane with his uncertainty about the future, I hate that my son has no fault in any of this yet he will be the most affected, any advice? Have any of you gone thru anything similar, thanks in advance and please no dumb comments!!!!