<human>: So a little background: Last summer she met this guy (Let's call him Carl) who she later ended up spending her entire summer with. All they did (according to her) was having sex but no real feeling was brought up, at least not for him. She said she had some tiny feelings for him in the end but nothing more. He was screwing around with other girls, so she thought she could screw around with other boys too, so she want to make-out with another guy and Carl got pissed and said he didn't want anything to do with her. 

That was according to her what happened. Now when we got together on November 22 2011 he texted her ''Oh I regret letting you go'' and something like ''I want to have sex with you''. I mean, come on. How am I not to be pissed at that, and yet she gets pissed every time I bring his name up. Now, 20 minutes before her bus was leaving she said she was going to town to meet him. They've texted back and forth during me and her entire relationship, but they've never met. Of course I get angry, and tell her that I dont like it. She get's pissed and starts telling me I always get's to do stuff but she doesn't. That is not the case as all. I've never talked with any of my ex's because i know it would piss her off. She just left and it ended up with me in tears (im pretty sensitive). 

What am I to do? It's not that I distrust my girlfriend it's just that I really dont like her spending time with that creep that im fully aware wants to do her and wants her back. Please help me out.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: My girlfriend is hooking up with her last summer sexbuddy who have admitted that he wants her back and wants to do her, and I dont like it.