Pregnant and single, new guy?

So, the title is insanely cliche but it usually gets attention that way ;) anyway, as it says I am pregnant. It was unplanned but certainly not unloved nor is it unwanted. I'm just over 18 weeks and the father and I have gone our separate ways. We've always had a very rocky relationship. He's a drug addict, "shake and bake" meth is his drug of choice. He used up until about halfway into our relationship. He got sober and we had an apartment together and I ended up getting pregnant. I had moved out of his place before I got pregnant because we were fighting so bad. Anyway, he ended up running away all the way across the country to "start over". After a month or so he decided to come back to me and the baby but he ended up deciding to move in and live with this other girl instead. Gave her the run he was going to give me and was fraught up nasty to me all over again. Harassing me and everything. Had his friends harassing me, he was harassing my friends. Just a bad situation. Well, for about a year now I've been talking to this guy in the Air Force. We've been friends the entire time and he's been here for me through all of this drama. He's recently admitted to having feelings for me (which was a shock) and I'm obviously not going to do anything about it just yet because it's simply too soon, my life is too hectic. But this guy is so sweet and he's more than willing to step up for the baby if we do wish to be together in the future. The problem is, he's in a different state and gets to come up this way about once a year. I have no problem with a long distance relationship, but they're hard. But because he's in the Air Force, it does complicate things. I'm just so very confused and I really just needed to vent as I've haven't told anyone about this new guy.