Mediator being your husbands friend is unethical imho but having said that there’s not much you can do since you agreed to it. It wasn’t forced on you. Friends and relatives could be your lawyers and mediators and whoever else but you don’t have to agree to it. Clearly a friend is not a neutral party.

Legal advice from a lawyer who is no one’s friend is the smartest move. If they say you have no rights here then at least you know you tried. I now think that he knew about money all along because he started offering you money in exchange of dating pretty early on in a divorce process. What money? He supposedly had none. He even offered to buy condo. Again with what money