Sometimes, i won't tell...... Somethings, i just keep in my heart...
If you still love a person that you think has forgotten you...tell her/him. Maybe that person has always loved you. And if you don't tell her/him today, tomorrow can be too late.
If you really have friends who you appreciate... tell them. Maybe they appreciate you as well. That if you don't and they leave or go far away today, tomorrow can be too late.
If you love your parents, and never had the chance to show them... do it. Maybe you have them there to show them how you feel. That if you don't and they leave today, and then tomorrow can be too late.