Choosing a thought (in or out of my business)

After 19 years of marriage, my husband is questioning our compatibility and whether or not he can get his needs met. So he is questioning whether or not to stayed married. I would like to work on our marriage and he is currently unwilling. I am having feelings of anxiety and insecurity when I think he will not work on it and we will get a divorce. If I am looking for a new thought, do you recommend I simply pick something like “It will work out,” “We will work on it,” “We will have a great marriage” (which is not under my control) or something like “I will be ok no matter what” (which is in my business) or just choose based on what feelings, actions, and results I want?