Some Frienship should be retained while some I m willing to break it

I am too dissapointed with the incident that happened to me recently.....Let me revised what has happened recently:
Last semester, i felt extremely exhausted with wat happened to me. she is having the same problems with me so both of us share the same experience and together sharing happiness and sadness. But i told her everything that i felt because i trust her.
At the start of this semester, she went to tell all the secret that i told her to one guy. Why she do so?She ask me to go to her unit coz she is feeling sad. So i went to her unit.She asked me to stay at her hostel overnight and went to school tomoro with her. So when finished my homework, i said i needed to go back to my unit to sleep....
At the next day, she feel tired because of sleeping late the day before. Therefore, she went and told the guy that i went to her unit and did not want to go back to my own unit. What has actualy happened was she asked me to stay at her unit to stay beside her...When turning, she made her own story to cover her tiredness and brought me up to the table.....
then the guy came to scold me for being thickface to go "kacau" her until late night and that same time she went to tell the guy about my secret that i told her.....Fine, i m the one and she also knew the truth. Fine, even she wanted to change the truth, i m ok with it coz i did not want to embrass her. But at that day for being scolded, that is the most embrassing day i ever had since the day i was born....
I admit that i swear to myself that i wont tell her my secret again coz i do not afford to face the betrayal third time by the same person. But i thank to her for what she has done for me, she was my good frenz but i think that now is no more frenz.
What happens is that that guy now fell in love with her. That guy for her : is not handsome , not intelligent at all which do not fit any requirement for being her boyfrenz. So i advised her if she don wan to have any relationship with him, faster clear it and do not let him to have any thought on her.....Then she asked me to help her with that problems coz she think that the boy is a bit "kacau" her all the time.For my both frenz benefits, i decide to help......how i help:I keep critic her in front of him so that when he knows that actually she is this kind of gal , he may not go and "kacau" her again which is the wish of that gal. Surprisingly, the guy went to tell the gal that i talked bad about her. A first i thought the gal would still remember that she asked me to help her and she would know what i m doing now is juz helping her. But she turn round when facing that guy she changed ad. I couldn't believe that i m being betrayed for the third time. I should have know she is this kind of gal. Now the guy misunderstood me and he is willing to break the frienship with me whose i m doing this for their own benefits......I could't beleive that he is willing to listen to one man's word juz like that.....To prove the fact that i said the gal is cheap, the guy is willing to force one of my frenz to admit the things that i got said that gal is cheap and the guy is willing to have cold war with my frenz juz becoz he is not willing to do so.....
This freinzship is useless ( i don wan to say that but i couldn't lie to myself)..
What i m still feeling good is that i still have he support from the group of LengLui from 711. i thank them and i appreciate that. i have to say soorry to them if i have done anyhting wrong last year that made them angry.......especially FooFoo coz she knows how i feel right now. and thank to maggie, zaza and earings that for calming me down and give me the solutions for this...
this is becoz i m again being betray by the same person again and i m being misunderstood by others becoz of helping others. I shall not do so again. MYOB enuf (suggestion from drew). Now i know who is frens and who is not anymore....Sorry i have to say that but it is true
MYOB !!!!!!!!!!!!!!!!!!!!!