Hmmm--you could ask (attack?) him about it at the risk of making him feel defensive and wanting to get away from you. Or you could LET GO and let him do what he's going to do and you can go do what you want/need to do. It doesn't matter where he shops--he's a nut for telling you about it--but what difference does it really make in what is going on right now.
You seem closer to transitioning over to letting go of the rope--please don't get pulled back into being a victim and needing to confront everything. Asking him how he would feel if you had an A with the grocery store manager isn't going to get you any closer. He will never know how it feels unless it actually happens and I'm guessing he believes you would never do it. Maybe he needs to wonder a little about you. What was it about you that attracted him in the first place? Can you work on that? Do you want to be that person?
You can either make yourself crazy trying to second guess his every move or you can let go and get some peace. I think if we truly want to save our Ms we may have to do some things that might make others think we are crazy, like being nice to a man who has broken our hearts and try to understand his pain and guilt too. Otherwise, why would they hang around if we are just going to keep reminding them of what they did and how they hurt us? Now, if we don't want them around that is another thing. Sorry, Cally, I don't mean disrespect, I just don't agree. You might think I'm talking out my a$$ but that's ok. We are all just trying to help one another.