<human>: My ex and I are both 23 and we had dated for over 3.5 years. She was my first long-term relationship and I was her second relationship. We went through so much together; deaths in each of our families, changing career paths and changes in educational institutions.

In the end, I broke up with her(last saturday) because I wasn't 100% emotionally invested with her, mostly because of major differences in sex drive. I had lost motivation in "us" because she was unable to perform in bed on the same level as me. This was went on for about a year, and whenever I brought it up, she would say I was only ever thinking about sex and I wasn't being fair to her. She's on anti-depressants for dysthymia and they seriously diminish a person's sex drive so after a while I told her I understood and just left it alone. On average, we would only have sex/fool around once every three-or-so weeks. I was also fantasizing about cheating on her non-stop since I had lost weight. I even came close several times, but stopped myself from going through with it(I know, I sound like a fucking asshole).

Another major reason I broke up with her was that I was afraid of committing to her. She would jokingly(but with with a grain of sincerity) test me by asking if I was ever going to propose to/move out with her. I never played along because I felt that if I had, I would just be lying to her and to myself.

I had asked her if we could still be friends despite the breakup and she said yes. We are enrolled in the same program in college together so we bump into each other quite often and we'll always say "hi", but that's the extent of it. I avoid having conversations with her on campus by telling her I have work to do, but deep down, it's because I'm also tremendously hurt by going through with the breakup, and I don't want her to get any ideas that we could get back together or anything.

I might wait until the semester is over so we can be alone to talk some more.

Can you condense the text into a few key points?
<bot>: We broke up after a long time, went through shit, I wasn't committed so broke it off, decided to still be friends.