<human>: So there's this girl.  We'll call her M.  M and I met about a year and half or so ago, and really hit it off.  We both live in the same town, but she is from the other side of the state, and only lives here during the academic year.  We knew we'd go long distance not long after we got together, and last summer we did that.  Fast forward to 4 months ago, M and I decide to "take a break" for the summer, due to strains arising between us, and to avoid the tensions of a long distance relationship.  

Four months later, M and I want to get back together.  There's a really huge issue that we cannot see eye to eye on, and it's absolutely killing me.  Not long after we decided to go on our "break", M hooked up with a somewhat mutual friend of ours.  I was upset, but I realized it was the kind of thing that was going to happen.  Now, she tells me she wants to get back together with me, but she is STILL friends with, and hangs  out with this other guy.  This is something I'm totally against, for obvious reasons.  She tells me that I'm "being controlling" and "telling her who she can be friends with" by saying that I don't like her hanging out with this dude.  She says I "need to trust her", but I really find that difficult.  It's a huge violation of MY trust that she wants to be friends with this cat, and at the same time be dating me.  And beyond that, I just think its really fucking disrespectful.  She says that being that this guy is a mutual friend of ours (a friend's roommate, actually), we won't be able to avoid him, and that I should just accept their friendship.  Its really exasperating, and I don't know what to do.

Can you give me the gist of the text in a nutshell?
<bot>: girlfriend and I took a break, and want to get back together.  She insists that I have to tolerate her friendship with a former fuck-buddy, and I can't get behind that.