I went out this past weekend and met a man (P).
I see nothing wrong with it and you have nothing to feel guilty about.
This is a far fetched scenario, but could he be trying to get to her through you?
He obviously can see her Facebook friends and may have recognized that you
We had a talk about that today and he says he didn't know who I was.
If she still has feelings for him or wants to keep him as an option, that's her problem and she needs to get over it.