I was in a similar situation. Broke up with my ex, after it for more than a year we still met every day cuz we were in the same learning group in the uni. It was hella hard. There was no day when I didnt think about her and the memories, but I constantly reminded myself why we broke up and how bad it was at the end. This was more than 2 years ago and yet today there are still times that I think about her, but these are just flashes that go away instantly. So don't worry, just be hard, focus on anything else and you will forget it. And don't stress yourself about this, just live your life!