Never say goodbye if you are not truly done. Never treat another bad if you still want them. Never make them suffer just because they love you, appreciate and admires you. Be sure to cherish the moment they had with you because that moment may never comes again in your life and by the time you realise how much they mean to you, the loves must have diminish from them or you may know longer have the chance to really tell them how much they mean to you and that could be the biggest regret of your life
Therefore, appreciate those that show you love, reciprocate it, admire them and let them know that they are loved too.