Gordie - I really don't know. During the initial BD (10/23/16), he told me there were "people" who expressed interest in him. I really believe these "people" are actually one person whose identity he does not want to reveal to me. He doesn't tell me anything about her, just that she's more supportive because he gets "zero support from anyone around here" (even though the whole house was divided up differently to support his need for space, my children have to share a room now in order to give him his own room, I spend 95% of my time working on/thinking about his needs, and everyone has been walking on eggshells for months)
Because of the nature of our conversations and his complete willingness to say hurtful things to me, I do believe him when he says there's no physical relationship. In fact, he does not consider it an affair at all. But he did mention during couples therapy that "these people" are not comfortable getting involved on more than a platonic level while I'm still in the picture.
Although that was a bit of relief, I also know that anything can happen. When my H and I met he was the pursuer and was extremely persistent, even waiting outside my dorm room (in college at the time) after I came home from dates with others, so I think he will still try to pursue her, regardless of what her boundaries are. Hopefully, she will find that desperate and unattractive ;-}
Me: 45 H: 47, M 23 yrs., T 27 yrs. S6 & S13 BD: 10/23/16 11/20/16: In-house Separation 12/5/16 H goes to IC , stops confiding in me 12/29/16: Start MC 2/4/17: Trial Separation/H moves out