Most Helpful Guy
Most Helpful Girl
This is obsession. You need to work on trying to NOT think about your ex and moving forward with your life. Right now you are living in the past and sooner or later it will really damage you, whether that's being unable to have other meaningful relationship or drawing you further into delusions.
You need to keep your mind busy and free of him. It's not easy and it has to be an active choice you make. Find hobbies to do or spend more time with friends or family. When he pops up in your head tell yourself to stop thinking about him and do something to distract yourself. Ask a friend to hangout and take your mind off of him. For some people it's easy to just eventually let go. Others have to put more work in to moving on after a breakup. You will definitely be the latter.