I read some of your backstory and agree with many of the other posters that your therapist was very inappropriate to put it mildly... he ought to have passed your case on to another therapist and stopped seeing you.

Do you currently hold fantasies about him, or is it really over for you? You need to be clear and, if you still are pining over him, to seriously ask yourself why? And to discuss it with your current therapist.

I'm sorry you don't have the closure you want, but I would caution against looking him up, as I think that might make you spiral downwards.

You could try writing a letter about it and then burning it in a symbolic exercise in "letting go".

If you feel that you need more information or need to be assured that he's received adequate discipline, you could contact your lawyer.