<human>: Summarize the given text in a few sentences.

Long story short: me[17M] and my ex[16F] are no longer together and she moved on to another guy. I've always been the quite shy guy and she really had some nice things to say about me whenever we were friends. However, once we broke up she snapped. She told people that I was a stalker and a creep. She told her mom how terrible of a person that I am and her mom then called my parents to tell them how upset she was. She also called my therapist to tell her that I had been stalking her daughter. (she knew who my therapist was and found the number). I was then told by her mom to leave her daughter alone. I'm not allowed to talk to her at all. and My ex personally said she doesn't want me going to lunch anymore....There is a table at lunch were my friends sit. There's no other table to sit at, and since she doesn't want me there, I have to sit in the library until my lunch period is over. My ex then told my friends at school that I was a creep and turned some of my best friends against me.

My ex even told my only friend that I have left this. Lets call her 'K' [16F]. Me and K have gotten to be close and I may start developing feelings for her. However, my ex told K "stay away from him, dont talk to him because hes not a good person and you shouldn't talk to him." Now she has been the only girl i have had relations with and i am not known as a creep. I don't know how she even gets "evidence" for people to believe her. Shes basically telling lies and rumors about me that are ruining my reputation. Advice on what to do?
<bot>: My ex spread rumors that aren't true about me being a stalker and it has lead to me losing friends and being afraid to go to school. What do I do?