<human>: Give me the gist of the text in a nutshell

Original thread: 

*My girlfriend of 1 week just told me that the dude [Dude 1] she cheated on her ex bf with and her are becoming friends again. They have been friends since highschool and were sexually involved 4 months ago where she cheated on her bf with him. I met her after she broke up with her ex and stopped seeing Dude 1 for sex. I certainly don't feel threatened by Dude 1 but I cant help to feel like there should be some sort of boundary with her involvement with him. I told her that I would like to meet Dude 1 and for her to make that happen but I'm just not sure how I should handle the situation.*

I thought maybe r/relationships might have different advice. Some more info on the situation: She took my V card and I do dig her but im just really frustrated that I'm having to deal with this a week into the "official" relationship. I'm going to visit her tomorrow and at the moment I'm planning on telling her I'm totally not cool with this dude and she needs to cut it off with him. If she can't do that then I'm going to end things with her right then and there. Any and all advice is much appreciated because I'm just really confused on how I feel about the situation.
<bot>: Girlfriend of one week is becoming friends again with the guy she cheated on her ex bf with, I am really confused on what to do.