Most Helpful Guy
If you still care for this person that's normal. Just keep busy doing things and with other people (and not activities you used to do with your ex). It will take a bit of time but it will happen. It's the normal process of moving on.
Most Helpful Girl
It's normal and natural that you are going to think of your ex. It's very soon after your breakup. It's going to take time to make it easier to get your mind off him. It's too fresh in your mind for you to just distract yourself. This is all part of the breakup process. The only think you can do is to try and distract yourself by filling your day up with things and to not give yourself time to sit and dwell on the past. There are many things you can do. Workout, go visit friends, go for a walk, go to a movie, watch series..