None of the options are correct for me. Why would you divorce them when you were in on it the whole time? And on the other hand,  why do you even need to forgive them when they lose? They are human, in fact when your partner loses what you should do is to go and console them. Make them understand that they may get it next time. And you should have told them from the onset to quit gambling or maybe play safe so they don’t lose everything instead of feeling offended when they finally do.