A time will come in your life where some people will regret why they treated you wrong. Trust me it will definitely come.
“Don’t waste your time in anger, regrets, worries, and grudges. Life is too short to be unhappy.”― Roy T. Bennett
Make the most of your regrets; never smother your sorrow, but tend and cherish it till it comes to have a separate and integral interest. To regret deeply is to live afresh.
One doesn't recognize the really important moments in one's life until it's too late.
When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.