<human>: I can't help but feel like I deserved to be left for someone else after being on/off for 3 years. The guy she left me for, ended up leaving her a month later (after having sex with her). She made me think she wanted me back as soon as he dumped her, but then had another boyfriend a month later. I've been NC for a long time now, but I go to school with her, so I can run into her on campus. 

I feel like her leaving me for someone else was completely warranted. I feel like both times that she left me, I deserved it. The first time she left me, she told me that there was a guy who she thought she had feelings for.. He ended up not wanting to date her. 

Some people may find it easy to chalk it up as "her loss", but I can't.. I can't see it as being a bad thing. Even though if someone did the same thing to someone I cared about, I'd think they were awful.

Condense the text into a few key points
<bot>: Can't stop blaming myself for the end of my relationship/being left for someone else. Feeling worthless/hopeless because of it. In need of support.