How to Move On After a Breakup

How do I get over a breakup? I keep running over the things I did wrong and beating myself up for it. I know I need to move on and it I will eventually find someone else but I miss them so much and I don’t want to move on. They taught me so much and although I was a handful they put up with me until we both weren’t happy anymore. I wanted to fix everything in her life and make sure she was always in the best mood possible. I brought into the relationship insecurities that I thought I had in check. They did too but eventually because we wanted different things in the future I kept stressing about it and bringing it up. They are at the beginning of college( their sophomore year) and I just finished and am starting my masters so we wanted different things and were in different spots. They did not know the future and I had this one vision in mind. It became too much of us trying to make the other happy without looking at our own happiness. I have all the answers and I know I need to move on but I miss all of the good memories we had.