Long story short, my girlfriend knows a guy who lives in the UK, she lives in America. I also live in Canada. Lots of long distance shit going on here. A few years back she was in a relationship with this guy, but it only lasted a couple weeks as they weren't really feeling it. However, to this day, they're still best friends. She doesn't talk to him nearly as much as she used to before her and I were dating and I trust her enough to believe this is truth. Keep in mind I have always been a bit uneasy with him however as the relationship they were in for those two weeks was pretty sexual from my understand she gave of this guy. 

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Today however she sends me a text saying she wants to visit her ex sometime in the summer for a week. By herself. And I absolutely flip the fuck out on her and tell her she can't visit him by herself for a week, certainly not across the fucking ocean either it's not like he lives in town or anything. I frankly don't care how much I trust her, it's him I don't trust. I've barely spoken to him in the last 7 months I've known my girlfriend so I have no reason to trust him. I even straight up told her if she visits him without my go ahead I'm going to break up with her as I won't be able to deal with the "What If's" that will be going on in my head. 

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I don't want to be an asshole, but now after an hour of cooling down a bit without talking to her I'm honestly not sure if I'm justified or the asshole for this. It's not like I told her to cut contact with the dude, but at the same time this guy is suicidal and she's the best friend he has. I am completely conflicted as to what I should be doing right now. I can give more details if anyone wants, although I'm sure no one wants a transcript of the last 3 hours of our conversation lol. 

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I'm going to apologize either way, but its up to you internet strangers to tell me what exactly I'm gonna apologize for. Thanks in advance random asshole judgers. 