How do I cope with my boyfriend being friends with his ex?? It’s not something I understand because once my past relationships ended I’d delete them, no more contact. Why be friends with someone who wronged me and/or I don’t like anymore?

However my boyfriend says he was friends with his ex’s first and they are still friends so they talk sometimes... even though the relationship was bad.

I fully trust him, but I just don’t like the fact that they are friends... how do I get over this??