<human>: Me (23M) with girlfriend (20F) of nearing 3 years, I've been out of the country for 8 months working and have another 4 to go, so this is currently long distance.

She and I have had issues in the past with her going to her guy friend's house and hanging out with him and/or the crowd who tends to be there. The first time it became an issue is when we had a Skype date planned in advance and she bailed to go to his house and babysit him because he dropped acid and called her because he had nobody there to take care of him in case it went bad.

The second issue was when she was there at a party and "had a moment" with his roommate. She promises me this consisted of just a long hug, and I believe her. Nevertheless, I considered it bordering on emotional/physical cheating as I have never met this guy. 

She has been up front about both of these occurrences,  I never had to drag anything out of her, although I did have to spend a little time explaining why they are such a big deal to me.

She's gone over a couple times since those incidents and we've fought about it each time. She decided to go over there this week some time and we had our worst falling out yet about it. Basically, she understands my reasons for not wanting her to go over there but still insists that she needs to because they are one of the very few groups of good friends she has (this is true).

So, which one of us is being unreasonable? I have what I consider to be good, valid reasons for not being comfortable with her going there, she understands these but wants to go anyway because they're her good friends.

Can you give me a shortened version of the text?
<bot>: I have what I think are a solid set of reasons and examples why the environment my girlfriend puts herself in is toxic to our relationship, she wants to keep going over anyway because they're her good friends.