Friends???

what is friend consider as?anybody can tell me?
i really didn't know what the meaning by "friend"?

i used to have a very close and very helpful friend, but after one incident, they act like didn't know me and always said bad behind on me, not only this, somemore they said in front of my junior.
why they wanted to do this?isn't they got any profit after tehy back tab on me?

although we are not in same tutorial class, but still can meet up in universiti, some time hv to attend lecturer class.really didn't want to see their face, one virus, one big fat potato, one big fat pig, then two more act like innocent people, but in behind they are another person.really bad this kind of people.

in my tutorial class more serious, got one classmate really really have a bad attitude.
only she can do the wrong thing, if you do the wrong thing she will mad about you, some more if she need you she will take a really good care on you, and when she didn't need you she will show her big black bowl face to you.wanted to vomit when see her face.somemore is my creative startegy group member, really silly, childish and liek a no brain person, where got people think an advertisment and tv commercial using chicken as the focus point, only stupid people will do that, some more she though is very cretive, hello, please la, clean ur brain.
another calssmate, she are good friend with the person that i mention above, she always act like she was a innocent person, very weak, talk soltly, bla bla bla, but in behind she will kill you by word.reallyhate this kind of people, previously she was joined another group of people, but suddenly she said she wanted to move out and be a good friend with the big black bowl face.haiz.

luckily, i got a few friends that understand me, i really appreciate it.