Redirect your energy. We all sacrifice part of ourselves for marriage. There's nothing wrong with that, it's part of the deal. What were some things you loved to do before you got married but put aside during the marriage? Think about it and you'll come up with them. A hobby, going to school, switch careers, get a career, whatever.
The problem is you're still acting like 1/2 of a married couple and you're not. Not at the present. Instead of being 1/2 of a married couple you're a whole single person. Your life belongs to you 100%. You don't have to check with anyone else about anything. Want to eat PB&J for dinner? Go for it. Watch whatever you want on TV, the remote is 100% in your control.
Find a passion and pursue it passionately. Energy spent on worrying about them, checking up on them, is wasted life and life is too short and precious for that.
In this situation you're the winner. On one side you have two liars that will pursue a liar's union. That's doomed. Whereas the other side has you, a person who kept their integrity in tact. The better half.
You can't control what happened to you but you can 100% control how you let it affect you.
Find your passion and pursue it passionately.
Good luck. I'm rooting for you. I know you can do it.