How to deal with my situation?

This guy made me believe he loved me but I stayed around even when it got bad. I should of left when I could we are no longer together. Now the woman he with he treats really well and I heard from a friend that he going to propose to her. We dating for a long time, but I still see him because we live in a small town. I see them out and it just really hurts. How do I cope? I am talking to someone else but I always think back to what could of been. Because I was really did love him and I thought he felt the same. I hate how I still care about him.
How to deal with my situation?
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