My Boyfriend's Best Friend

Yesterday, my boyfriend told me that he was going to the movies with his best friend (who is a girl). He's known her longer than me, & him & I have been dating for almost three months now. I can not see my boyfriend as often as I would like, because I don't drive, & we live a few hours away from each other. When we do spend time together, he drives to my side of town, & we'll spend one day together over the weekend. Our work schedules are different, & we only really get to see each other once in a month.

He spent his entire day with her yesterday, & him & I only talked a few times before 5 PM yesterday. After 5, I didn't hear from him at all before & while I was sleeping. We talked a little this morning via text message, & he said that he fell asleep over his friend. Now I don't know if that means he slept over her house, or he slept next to her or on her lap. I don't know, but it made me uncomfortable that he told me that. This is my first relationship in 5 years, & I really don't want to be that girl who tells him who he can & can't hang out with.

I trust him, & he trusts me. The only thing is that... He's the type of person who will not just drop a friend because you don't like them. You have to have very strong reasoning as to why you think he should just drop someone from his life. He's mentioned this to me before, at least 4 times during normal conversation, & I know if I say something to him about how what he did made me uncomfortable, I'm gonna seem jealous & I'm gonna look bad & he's probably gonna just not do anything. I mean, he knows her longer. He's even said that she is seriously the only person who knows everything about him.

I know some things about him that he's told me about, but I'm not her. So I don't know what she knows about him. He's mentioned before that she has gotten jealous about an ex of his before when him & his ex were dating at the time. I've never met any of his friends (or family) in person. I don't have friends, so he's never gonna meet anyone I know. I don't have a good relationship with my family, so he'll probably never meet my family. I don't want to seem like I'm overreacting, but I'm really not okay with him falling asleep on his best friend, or falling asleep at her house.

I don't know what to do. I've let some little things slide since we've been together, but it's never been something like this since we've been together. We've only had two problems since we've been a couple, & we always promise to never go to bed angry at each other, & that if him & I have a problem about something one of us did, we always need to address the situation like grown adults. I'm 21, & he's 20.

I also had a dream last night where he was in his car with a girl. I've never seen this woman a day in my life. They were wearing matching shirts, & somehow, he had me Skyping with the two of them. Like I said before, I've never met his best friend or any of his friends since we've been together. In the dream, they kissed each other on the lips, & after that, I woke up & just couldn't fall asleep again. I don't know what to do. I'd like to address this with him, but I don't want to argue & seem like I'm jealous of what they have. I just think it's disrespectful to me that he fell asleep over her house & probably on her.