But You know guys,there something more important than a friendship... Besides she knew it very clearily that this what she is doing with this guy is so totally bad,and when she was talking to me or other girls she was sorry for screaming at him all the time,slaping his face for nothing last saturday etc... The worst thing is this is kind of person who can't say "I'm sorry it's my fault" to the person who should listen to that.And she know it clearly.Besides there was nothing to fix,they were already done with them selves,I just helped him understand some things,because I know two things: she would never do this and I know how it feels like when You don't knoe the whole truth and You're starting to make You own stories in head...
You should think if it's worth to be blind just in name of a friendship... And after all I just helped her saying some thing that she couldn't face to say.

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To be angry is to revenge the faults of others upon ourselves...