Dealing with the past

I had a discussion with my husband about ensuring we don't revisit places we had been with our exes in order to avoid any drama. We got married just over a month ago. Unfortunately we want to the laundry and we saw his ex there and he looked quite uncomfortable and she was straining her neck to see us. I felt upset cos I had told him this was the kind of discomfort I wanted to avoid. She had been calling him even after we got married which was an absolute no-no. What are your thoughts? How would you handle this?