Husband still friends with his ex's

So my husband told me he still talks to his ex's long before we ever met. I personally don't talk to my ex's, they are an ex for a reason. But it bothers me a little knowing he's still friends with them adm still has conversations with them. Idk if I'm over reacting but I just don't see the point in it. How do you feel about it? Because I'm not too sure what to think. 😞