You may want to backslide
Remember how we said your brain is conditioned to help you avoid pain? Because of that, it might play this nasty trick on you. “The person might cycle through periods of avoiding the emotional pain by second guessing on if they could have made it work.” There’s comfort in moving backward. Even if it’s not great back there, at least you know what’s there. You know what to expect. You can’t say the same of moving forward. So you might convince yourself you can still make that relationship work with one more try, as a way of avoiding the pain of having to really move on.