I'd go for it if I were you. I see three possible outcomes:
1. You are pleasantly surprised. The two of you discover a new relationship that works.
2. You are pleasantly surprised. The two of you discover a new relationship but it fizzles after a while.
3. You discover you haven't finished learning your lesson from your breakup two yrs ago.

You'll end up older even if you do nothing. You'll end up older and wiser doing any of these three. You could end up happy too.
Hey, way beats any Vegas odds!