What should I do now?

My ex left me another guy and they continue to laugh and smirk whenever I'm around. She doesn't even acknowledge me and makes fun of me. She has also lied and told all of her friends that I abused her. They all try to intimidate me and stare at me for this. I lost many friends because of this. She also knows I suffer from major depressive disorder and this made it worse. I have also been to a psych clinic for help. I feel like committing suicide everyday. What can I do?