He's your ex .. not your problem anymore. Move on and don't continue to let them have any power over you.
Think of something different. Go to places, you never went with him. Meet people who do not know or will talk of him. Find a boyfriend/lover
Just stop thinking about him and them?
Stay busy. Do something productive. Do something that keeps your mind off of things. It's easier said then done but you gotta at least try right?
Be done with it. Move on. It doesn't matter in your life, to you, they don't matter to you either. Wash your hands of them all. Whatever happened, your chances of having a resolving of all issues to your satisfaction are very slim. Don't let it eat you up and make you bitter. Then they'd win.
Make a clean break. Choose to let it go, use energy in a positive way.
deal with it
walk away and do not look back. ya never know what lies ahead of you.
take up stamp collecting