<human>: So this girl and I have been casually hooking up for the entire semester. During this time, we have slowly moved from hook ups to friends with benefits to always hanging out and sleeping with each other and it was really starting to feel like a relationship.

The problem begins when she brings her High school ex down for a weekend. we hang out and get along well with her ex (also it should be noted we look remarkably alike). She sleeps with him this weekend and also leaves a party crying because he was hitting on other girls.

This weekend was followed by a long text explaining that they had a past and that she wasn't planning on dating him. As we had just begun hooking up, I said it was fine and I understood. We go back to normal and are really starting to hang out a lot when I get a text from her saying that she was not looking for a relationship, (at this point neither was I) and wanted to stop hooking up. We still hung out and it became obvious that her ex was texting her again. 

She goes to spring break hangs out with her ex all week as they both went to a common spring break spot. They hooked up and were like they were still together. We still talked the entire time and she let me borrow her car.

so we start hooking up again the week after break, things start off casual and slowly lead to a more relationship like feel. We both were sad to leave each other for Summer. we made it clear we both like each other a lot, but she said she couldn't do long distance. I said ok and asked about her ex. She essentially said that she is still in love with him (and he said he doesn't want a relationship with her) and that she wanted the summer to figure things out and that she's trying her best not to lose either of us. The thing is this is the first girl I've actually cared about and don't want to be second to a past fling.

Any advice as to how to approach this fucked up situation.

Can you give me the gist of the text in a nutshell?
<bot>: girl I'm close to dating is still in love with her ex, and is trying to not lose either of us. advice?