MMF, tpaschal, Thanks for your thoughts. I just got back this morning from a wonderful trip with my 2 sisters and her family.
As for the concert-going question, I doubt he's interested in her. Here's what happened on 4/15 morning. Just as I was walking onto the plane, my phone rings. It was my H and I thought maybe it was about a problem with our dog. But no - he called to wish me a good trip! He was in a very good mood and very sweet. He said our dog was having a great time.... Anyway, then I asked how his concert went. Remember that the concert tickets were free and there were 4 so he had to find 3 other people to go with him. Anyway, the conversation: Me: How was the concert? H: It was awesome. Me: I wish I was there. H: You would have liked it. Me: How did <co-worker> like it? H: (mumbled) Her daughter and daughter's friend were there. [I think he was embarrassed about asking the co-worker along