Are you able to really let them go? Or are you just running into them from time to time? If letting go is the case, I know it can be very hard if you've shared a lot of memories with that person. Time will remove them from your thoughts in due time when you're ready to move on completely and forget about them. I wish you the best.
I always see them in and out of my Uncle's place where I work. We just cross paths constantly it seems. Not painful really, just makes me long for situations that I dreamed, but could never really work out in reality. Relationships...even abandoned ones...can just be so completely complicated. Maybe I should move. I am not a runner though so I guess I will just smile and keep on moving ahead with my life. Thanks.