Most Helpful Guy
You don't attract someone back from a position of weakness. Besides, you wouldn't want him around you because he pities you anyway. The best way to get him back (or, even better, get over him) is to show him (and yourself) you don't need him.
And no one says you need to give up your memories. You'll always have them, and you'll get to a point where you can be happy about those memories without being hurt.1
Most Helpful Girl
Sometimes its the memories you miss... not the person. People come out of a relationship a different person than the one they are at the beginning. So it is the person he "used "to be that you probably miss. You have both moved on, so it's pointless holding onto what's behind you. cherish the memories, but look to your future rather than looking at something which is over4