My boyfriend doesn't trust me but I trust him when I possibly shouldn't?
I am 20 years old and me and my boyfriend, who is 21, have been dating for about 4 months now. This is only my second real relationship and he is the only guy I have ever felt like I truly loved. We tell each other we love each other all the time, and he has even brought up marriage but I'm not sure he's completely serious about that and I know I don't want to do anything like that anytime soon considering how young I am and since we haven't been together that long. Things have moved really fast with him. I moved in with him and his family a few weeks ago, not just because I wanted to live with him though, I no longer drive due to my parents taking my off their insurance and there are no jobs within walking distance from my house which is the main reason I moved. Anyway, ever since day 1 he has not trusted me at all because I have been honest with him. He is the 13th guy I have slept with, and I was truthful with him about that. I was stupid and immature before him and half the guys I was with didn't mean much to me at all, and I have told him this as well. I have changed a lot since I started dating him and can't even imagine going back to my old ways now. I used to be the typical party girl just drinking till I can hardly walk and not having a care in the world. I have trust issues as well but for some reason I trust him. But the other day I was bored and just going through is Facebook and saw that he will leave flirty comments on other girls pages which I don't know if I should be concerned about. The last one was a comment on a girls picture.. some girl commented saying, "you're hot lets bang" and he commented pointing arrows to her comment saying, "what she said". I don't think he would ever cheat on me.. but for some reason this really bothers me and I feel a little bit like a typical psycho girlfriend for it. The thing that really bothers me though is that he can leave comments like that, regardless if he's joking or not, and if I said something like hi what's up to a guy he would say something like ohh talking to your other boyfriends? While I know he is sort of joking, I know he is also bothered. Majority of my friends were guys before him, and now I no longer have any friends because of him. He doesn't say I'm not allowed to hang out with them, but I've hung out with guys twice in the entire 4 months we've been together and he freaked out both times so I don't bother even hanging out with my friends anymore. I don't know what to do. I miss my friends so much but I love my boyfriend too and don't want to lose him. Sorry for how lengthy this was but I don't really have anyone to talk to about this and need some advice.