Well, he's still curious about you and is wondering how you're doing, he did have a relationship with you after all.
I know it hurts like hell. There is not much you can do though. You're already on your way, keeping yourself busy. Make sure you're not alone, surround yourself with friends and if you can, you may not want to, but cut him out from your life, delete anything that reminds you of him, pics whatever.
Time will heal the wounds, sorry it's a cliché but there's no magic tricks to get over someone.
When you feel better you slowly start dating new guys. It will keep your mind off your ex. Although, don't involve anyone in a new relationship or as a rebound as long as you're still hurting.
Take care
"If you love life, life will love you back."
Arthur Rubinstein