Most difficult to forget things are those who are attached to your ego.

  1. If you think you possessed a girl or person in question, it will hit hard. Hence love but not get attached. I might love some one but I am not attached to her. Any one can leave any time if they wish.(Don’t get scared.People leave only when you tie them and not when you free them).
  2. When you have habit of thinking about them continuously. I said before, love is a background music which never interferes. It is just an assurance and nothing else. When it starts interfering means your mind is using love as an excuse to avoid work!

PS : Mind always seeks reasons to avoid hard work.