This is an awkward relationship. It doesn't matter if the ex-boyfriend is a good person and a friend. Even if it is awkward at first, it will get along naturally afterwards. If your ex-boyfriend is a bad person, you should consider explaining the situation to your boyfriend and our relationship. If my boyfriend contradicts me, I will reconsider. After all, birds of a feather flock together. I will consider whether my boyfriend and ex-boyfriend are the same kind of people.