it's human nature to take things for granted, to only see the bad in someone but never see the good in him/her . that's why there's this word call "regret".
Some regret can be return and resume the life as per normal by saying the words "I still love you" or "I am sorry"
When ego get overboard. regret remain forever.
Cherie, love is also something to learn. you got to learn how to love, be love and give love.
Regret, is something which is to be learn too.