<human>: Summarize the given text in a few sentences.

My girlfriend of about 7 months went home for this school term, she's been gone for about 2 months now. She has a guy friend back home that she hangs out with a lot, and she assures me that there's nothing between them.

This guy and my gf have history; my gf describes it as 'weird' and that 'I wouldn't understand our(their) relationship'. She's told me that they've made out a few times, as recently as two years ago, but that there's nothing between them now. He has a girl that he's seeing, but I'm still thinking that its weird that my gf and him are still so close; it makes me nervous.

Problem is, she tells me things about the guy that don't make me too comfortable. He got pissed at her when she told him about me a month ago, wondering why he didn't know sooner and generally being a little bitch about it. This weekend, my gf went to a party with her friend (girl) and met up with him, he ended up sleeping at her cottage with two other guys, my gf and her friend. my gf then says to me that she doesn't like his girl, which started a fight as I'm wondering why she would even care if she doesn't have feelings for him.

I'm not overly worried that anything happened between them, but she's not doing herself any favours by continuing to hang out with this guy. I'm not gonna tell her to stop seeing him, I don't want to be that controlling, but it makes me angry that my gf can't see how this situation bothers me. She just blows it off every time I bring it up (rarely), saying that nothings gonna happen and that I'm overreacting.

Am I being too overbearing on this situation? Or are my worries legitimate?
<bot>: long distance gf, she hangs out with guy she has history with, assures me that nothings happening, Says I'm overreacting when I bring it up to her, don't know how to react