So my boyfriend and I have been together 5 months. Recently, he and a girl that I know have been pretty close as friends.

I don't know how to put it lightly, but it makes me uncomfortable. They get along really well, and that's all fine. He can have friends; however, she becomes rather touchy, even in a joking kind of way. Bumping into him repeatedly and other things of the sort.

He seems to be messaging her more often through instagram, but I am not the person to look into my partner's phone, I just observe.

She has called him drunk late at night. Twice. Each time, she does talk about another guy she is interested in, so it usually settles my odd suspicion for a minute.

But then we have what happened yesterday. After classes (college), my bf and I were gonna meet at my apartment for a little bit before leaving for a concert on campus. I wasn't going to it, but I had some service hours to put in through a small bake sale at the comcert.

When I showed up at my dorm, he was not there, so I shoot him a text and he says he is in a practice room working on some stuff (music major)

Come to find out, I show up at the building (where both the practice rooms and the concert hall are) and he is practicing alone with this girl without telling me.

I really hate how jealous I sound, yeah, I know.

I put the feelings aside for a bit and went put to talk to some friends from the club I am in at the lobby of the building, setting up the bake sale. We sit down and my bf and the girl walk out, all laughing and joking. He doesn't make one look at me and heads into the concert hall with her.

It wasn't until they walked in that I look over to see two very concerned faces of my friends asking, "what the hell was that?" They basically cemented my weird feeling about the friendship by also noticing the very "comfortable" interactions between my bf and another girl.

In all I just...I want to know how I can bring this up to him without pointing fingers and sounding extremely jealous.

I just want him to know I am a little uncomfortable and for him to understand I am not trying to keep him from having a good friend.

I want to just set some slight boundaries, you know?