Are you crazy, it's my husband so it IS MY BUSINESS who he wants to be friends with. We are a couple
It is the mother if his child. You have NO place in that relationship. If you can't handle that as the fact it is, you shouldn't be involved with a man who has children. He and his EX will and should be have a relationship for the rest of their lives. As a wife, it would be your business who your DH has a sexual relationship with but he is an adult and can be friends with anyone he chooses. If you continue to act like such a controlling psycho, you will lose him no matter what. People can't live like that too long.