I would go out w/him if we seemed like a compatible match. Why not?
However I would hold off mentioning your ex-husband for now + just cross that bridge when and if you ever do get to it.
I think you are kinda jumping the gun right now.
Slow down and take things one step at a time.
If you move too fast, you are going to scare men, (not just this guy), but all the ones you meet on here...Far away.