A true friend... 
-Accepts you as you are
-believes in you
-calls you only to say "hello"
-doesn't give up with you
-admires all sides of your personality
-forgives your mistakes
-helps you
-encourages you to try it again
-makes a difference in your life
-says nice things about you
-offers his/her support
-understands you
-tells you the truth
-never judges you
-explains things you don't understand
-walks by your side
-calms down your fears
-shouts if necessary, if you don't want to listen
-raises you spirit.