Most Helpful Guy
The best thing you can do is to move on and not worry. This will actually take time. Any trash talk he might do is completely immature and based upon a lack of self confidence. No real man would trash talk an ex...ever...Is he even nice? Who would do such a thing?
I felt the same way you did ten years ago with an ex. The feeling fades as the months roll by. Think about it. After about 2 months or so, shouldn't a healthy human heal and get over things?
You broke up with him...big deal. Folks do it all the time. People put too much weight on relationships. It's not like you had property or children or were (yick) married. (sorry about that, I think marriage is silly these days, but that's a different discussion...) It sounds like you need a bit of growing up to do. Don't date men who you would be afraid to run into at any time. I live in a small town. Date someone outside of your zip code. Live the best you can (I've been told excellent living is the best revenge)
The best psychotherapy is to realize your fear is just that...Your Fear, and you are telling yourself you are afraid. Why torture yourself? Stop over-thinking. Most of the time things end up working out. The second thing to do is to be 100% honest with yourself and him and anyone else you ever deal with. If you run into him and are uncomfortable, say so and leave. The truth never hurts after you say it. I think it will work out. Relax and happy trails.