Yeah, mate. When my ex left me, even my older brother asked me to not come to parties at his place because it made her uncomfortable.
She was there with my brothers' friend. She had been seeing him for a while and I was the last person to know. The whole time she had been telling anyone who found out about them that I was abusive and to keep it quiet for her protection (yet she was verbally and financially abusing me).
In the end I was shunned by almost everyone that I knew. I lost my home, my friends, most of my family and ended up in debt for years as a result.
Only my younger brother stood by me and stood up for me. Everyone else believed her. When I started dating my (now) wife, she was approached by several of my old "friends" and told that I was 'bad news' and to avoid me because I was abusive. My (now) wife told them she was "a grown woman and capable of making up her own mind, thank you very much!" We've been together 22 years, married for 17 years and have two amazing kids. In the end, though I suffered, I have come through way better off than I was then. The perspective that I have gained has made me much more aware of the value loyalty, friendship and love.
My ex married and had a kid with the brother's friend. They didn't last 5 years. She pulled the same shit with him, but nobody believed her this time. They had seen the same playbook when she cheated on me. He's still single, and she's with another ex-friend's brother, burning bridges as she goes...
Just take small steps, my friend. Start a journal. See a counselor. Get up every day and see what it brings. You never know what's around the corner. Eat right. Exercise. Just exist in the world without expectation and you'll find your place. May it be filled with joy.