Most Helpful Guy
its not a good idea for multiple reasons.
1. makes it harder for you to move on
2. keeps them at the top of your thoughts thus affecting your efficiency in life
3. you'll fail to notice a new potential boyfriend who is much better than the last guy because you are still thinking about the ex
4. if he has moved on, that will start hacking at your confidence and self esteem
and its a downward spiral after that