if u say " well i fell out of love with him/her", you are 100% lying. when u fall "inlove" with some one it is forever. It means they took a very big piece of your heart and there will always be memories of that person in your heart. love is one big special thing between you and another, u will always remeber that one special person. Im not saying you cant love more than one person b/c you can, but your love for one out of the two will always be higher.
Example:
i love anthony, he was my #1 love i will always love him more than justin but i also love justin.

so for this moment in everyones life if you have your love try to keep them, bc life without them, even if you have a new love it is just painful and trustly if havent gone throught that pain yet you dont want to, EVER!