My boyfriend told me he still cares about his ex

I don't like it because I don't have any feelings towards my exes but he said that's because I had shit relationships in the past and theirs was good so he is allowed to still care about her. He said their relationship is done and doesn't want to get back with her but none of this makes sense to me. If I saw my ex I would ignore him not go up and have a massive catch up session like he and her did! It makes me feel super uncomfortable and I told him that and he doesn't really care. I don't know what to do