How do you get the thought of your ex sleeping with other people out of your head, even watching porn makes me uncomfortable

I lost sexual desire. My ex is hooking up with my friends. Then halfassed lied about it. Her name starts with H so everyone calls her Hookup H____. That’s not embarrassing or anything. I got to see her walking holding hands with one of my friends and it didn’t bother me because I stopped loving her when the lying became constant. But I still have no desire for sex. Hookup culture is not for me. I gained a lot of weight over the past year so I don’t want anyone to see me naked anyway. I stopped eating two weeks ago. No appetite. I ate one meal, a sandwich and a bowl of cereal. Losing her isn’t my issue. The lying is what’s doing me in. I wanted no contact. She said I was her closest friend. Then nothing but lies and it’s depressing as fuck.

/r/BreakUps Thread