What is he doing?

First, I wouldn't worry about your boyfriend spending time at his friend's house while his friend was not there (skanky dressed sister or not).

I don't know either of you, and so I don't truly know your relationship but here is what I gathered.

It seems like your boyfriend is into you, otherwise he would not still be with you. Since your entire relationship has been long distance, I think that this says a lot.

I would like to talk about your concern of your boyfriend having more fun with his friends and acting like a bump on the log when he is with you.

When a guy hangs out with his friends, he does not have to worry about anything except drinking and having fun. He is able to unwind after a long week of work, and more so, most male buddies don't ask other buddies deep questions, or ask them to have to explain themselves for any reason. "Bro, you brought me a Bud, you know I only ever drink Bud Light, how can you know so little about me after hanging out for over 8 years, etc, etc." This is not something that a guy hears among other guy friends. Overall, he can unwind, and party, with no worries.

I'm not sure what you two do when you hang out as you didn't say, but since you are pregnant I suspect that it involves much more relaxing, sitting around, no drinking, and even possibly talking about the future. Understand, there is nothing wrong with this, and it's really what you should be doing since you are pregnant. But it's also understandable that your boyfriend may not be as energetic since he can't unwind how he prefers too.

I would talk to him about what you have noticed, how you feel, and also why you may be able to see why he is acting that way. Ultimately he needs to commit to being with you, and spending time with YOU since you are having a child together. Yet, you should be able to get a much better response if you approch this with understanding of his feelings and concerns. Looking at things from his side of the pond will typically get your man to start looking at things from your side.

As I said, it seems like you all have a solid foundation for your relationship, but like all relationships there are always things to work on. Try getting into something that he is into like UFC or HALO (a video game playing girlfriend is super by the way) and he should appreciate the effort and reciprocate.

I know this was a long response, but it was a long question. I wish you the best, and good luck with the baby!

I disagree with lilomeh. Though it's good advice for other situations, you are about to have a baby. You cannot act like a child and neither can he. You two need to have a serious discussion and he needs to make a decision and a commit to that decision. If he cannot, he doesn't deserve to be in your life. An immature boyfriend is one thing. A cheating (which he probably hasn't done yet but will soon), absentee, loser dad is another thing altogether and one that will guarantee more problems down the road than online gaming marathons.

I'd say start taking that time that you would normally spend together and go out with YOUR friends. Act like there's nothing wrong and when he starts questioning things act the way he does when you start to question. Maybe it will pull his head outta his ass and see that there's more to life than playing Halo. Like maybe his girlfriend and soon to be baby for example. It will also let him know that if he wants to be a dick like that, your not going to wait around and that you can have a life too. Hope this helps.