Help!

I think my husband wants an open relationship. We are ttc but I think he as given up hope. We already have a 5yr but he wants more. I m trying my best to unblock my tube. I need help. I don't want him to go, I don't want to have an open relationship... I just asked me what I would think abt it, I don't know what to do. I m confuse, I don't want to get mad and say things to upset him even more. Can someone please give me advice. Please!