I have a very good relationship with my ex. He is nice person and before starting our relation we were excellent friends. After been together for a while we realized we just dont work as a couple and we broke but we still talk often, we are good friends...
I think that all depends in the kind of relation you actually had with your ex.

not at all...I think it all depends in you and he..even a relation was great, after 2 persons broke up they could stay friends, or become big enemies...