My biggest question is are you willing to damage your relationship with your kids to make him pay for cheating on you? Granted the whole situation SUCKS. I get that you want no part of providing for him while he is living with his new love interest. Think about the example you want to set for your kids. Is marriage "Till death do us part", "In sickness and in health"or is it just till he ****** my off more then I want to deal with. Are you in a hurry to find someone else to spend the rest of your life with? You deserve to be happy. Only you can say what that will take. Think it through and decide what will be best for you in the long run.