No, I don't think you're being paranoid. I would feel the same way. Is it a good idea to revist the conversation? I don't know. If she's reaching out to him (which I agree is inappropriate), you may push her to reach out even more.
You said you're going through the worst time in all your years together. What's happening?
M: 37 H: 36 Married: Aug 13, 2004 Decision to Divorce: July 20, 2008 Reconciled: September 2008 Current: Ambivalence