Im sorry for saying this and its okay if you block me for saying this, but I don't think there is any love left in your parents relationship. From what I see, there is no trust and they have given up on each other. It is very unfortunate that you have to be involved in this. Please take care of yourself. You are precious to many people and although it is selfish, I don't want you to harm and/or neglect yourself. Just because things are going bad for your parents, I don't think you should punish yourself for something you had no part in.