My current semi-serious person doesn't speak to any of his exes but says it's mostly by choice. He says he's done w/ them and they are not contributing to his life in any meaningful way, so what is there to talk about?
It's def a red flag for me bc that outlook seems rigid and cold to me. But it's not a dealbreaker bc there are about a milion other worse traits I can think of.
I'd be more concerned about WHY his relationships ended rather than how he behaves after they do.