<human>: I'm in a long distance relationship with my girlfriend of 8 months, we are both 19 and are from the same highschool/town. She goes to college on the east coast and I'm on the west coast. I've visited her multiple times at her college and stayed in her dorm with her every time I went to go visit her...sex ensued..frequently

She has a male friend who is also from the same town as us, and they've been best friends since childhood, first dance, first kiss, first relationship and all that fun stuff. They've had a weird relationship dynamic while they've been friends as they were friends with benefits a little before I started dating her, but once I started dating her, he called her a slut in a demeaning way but they're still good friends? (she tends to let it go, saying he didn't really mean it and we have a mutual understanding of eachother, that things like that happen but we don't necessarliy mean it and we move on...even though they compleltely fail at communicating about those issues, they just ignore that it ever happened at move on..so they're good now)...needless to say I'm not a fan of him and have a hard time respecting their friendship as a real one. 

Well, she is hosting this friend to come visit her at her college and staying in her dorm, and that idea makes me uncomfortable just because of the past they have had, and her friend and I know each-other but unsurprisingly don't get along. They just seem super comfortable with each-other and I don't think they would act the same if I were in the room...I don't necessarily think they'd have sex, but I just don't think they'd act the same if I were there. 

I'm not coming to you necessarily wondering how I approach this topic with my SO, as we communicate superbly well, and I have no reservations bringing it up, although your perspectives on that are appreciated, I am more concerned with whether or not I am being rational in me feeling uncomfortable about him coming to visit her and staying in her dorm.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: My Girlfriend's male friend who she had an fwb relationship with is going to visit her at her college and stay in her dorm, am I rational in feeling uncomfortable about this?