Boyfriend “Ex” girlfriend keeps calling him. What should I do?

I recently started dating a guy, and his ex girlfriend calls him often. I believe one night it was her FaceTime him at 12am one morning. He never answers her when he’s with me, but it’s starting to make me uncomfortable. We spend so much time together so I’m not sure if he’s still seeing her. What should I do? And how do I confront him about it.
Boyfriend “Ex” girlfriend keeps calling him. What should I do?
Post Opinion