This is a really tough question, and there is no one-size-fits-all answer. I think it depends on the situation and on the person. If the person is still in your life, it might be possible to try to repair things and see if you can make it work. If the person is no longer in your life, it might be easier to try to move on and find someone new. Either way, it’s going to be a tough process and it might take a long time.