What if changing my thought isn’t good for me?

I am trying to wrap my head around this. My husband and I are getting divorced. This is our fourth time discussing divorce/moving forward with it. This is the farthest we’ve gotten and he, again, wants to try harder. Seek more counseling. Says he’s seen what he needs to fix. That we are better off working together and not divorcing. I disagree. I see our history and know we have tried but neither of us has been able to make the changes necessary to stop fighting. BUT. What if I changed that thought? If I thought things will get better? Then we could stay together. But I have thought this before. SO how do I know it’s time to change the thought or not? Right now I think we need to be separated in order for me to heal and to work on ourselves. I think the writing has been on the wall for years — he’s been so unhappy with his circumstances. Gahhh. I agree with my last convo with Brooke that maybe this is just what our marriage is – -complete. Is my thought really my choice or can I change everything by thinking a thought I don’t believe? If thinking a positive thought does not create a positive feeling does this mean it’s not the right thought anymore?