What should I do ?

The other day I posted a question, from the Fluther collective I got good responses and they started to confirm my gut feeling and suspicion about who the culprit may have been.
http://www.fluther.com/disc/23059/clever-pick-pocket/
My next question to the collective is what should I do about my “friend”, i didn’t catch him red handed and so he can’t be accused. At this point in time i have decided to not make any contact with him to see what he does or says. He isn’t a “friend” that I meet up with regularly either but would be in contact via email. So far I haven’t heard from him and its about 3 weeks since it happened.
Its churning over in my head now as I not sure if this is the right course of action to cut off from him, even if he sends an email.