Can't lose it ever !

There are some people that make their presence in your life permenent even if they are far far far far away they still come in your mind as a flash back... they remind you of a mistake you did... So you never do it again.. and to remind you that you lost Something was mostly your life.. and yet you still lost it...

flash back of the past... you feel happy for remembering the good thing in it yet you remember you can never have it again...it hurts more than making you smile :^) ..

Flash backs what are they to you?