<human>: Can you provide a brief rundown of the text in within 3 sentences?

So this might sound familiar to some of you, but I broke up with my ex girlfriend because she was a mean-spirited bitch. She attacked my roommate, a really sweet and quiet girl because she wasn't wearing a bra sometimes and she thought it meant she was trying to hook up with me. It ended up in this huge argument where she was yelling about how my roommate was just jealous because she was fat and my gf was a fit girl. I was horrified by it and I ended it that day and things blew up from there.

It turns out it was never about my roommate's bra, but I'm kind of stupid when it comes to stuff like this and never would have figured that out. 

Since then I hear a lot of rumors abut me, how I hooked up with my roommate (I didn't, she is in a relationship with my other roommate and they're very happy). How I'm a "chubby chaser" and all sorts of bad things. 

We're blocked on social media, and I don't get her texts, but I don't know how to handle this. We run in the same program at school and she spends a lot of time badmouthing me to everyone who will listen. Being called a "chubby chaser" doesn't bother me because it's obviously juvenile, but the way she talks about how I moved in on my roommate and slept with her, and some of the other stuff, is just awful. 

What do I do? Is there anything I can do or should I just keep ignoring it?
<bot>: Ex-gf can't let go of the way we broke up, and now she's spreading lies about me all over town. What do I do?