Is there hope or not?

I was in a 13 and a half-year relationship that was on and off. We’re in our 3rd breakup and I feel that this could be it, but I don’t want it to be. I hurt my partner emotionally and I’ve apologized for the stupid mistake, but he didn’t want to forgive. He’s still angry and hurt. I know I should move on, but I can’t seem to. I still have hope that we‘ll be back together, but it can’t be where we revert back to our old ways. I’ve seen us make changes and work out well until different circumstances come into play (i.e. school and work) that affect our daily lives and that we can’t focus on our needs for each other. However, maybe it’s really time to let go? We did try to grow and change a lot, but at our core… we may not be compatible… is it time to let go or should I wait out for that small hope?