Omg my friends a crazy *****?

Okay so im 15 nd my friends 14 she messn with this guy nd thngs aint turn out well the guy was a player nd she had to learn it the hard way me nd my other friends tryd to tell her wat she was doin was wrng but she saw him kissn another grl brite after her nd found out he did it rite before her nd she is heartbrokn cuz she had feelins wit this guy nd she thnks its her fault for not nown him enough nd for kissn him but even tho she stll cares wen she sees him wit another grl so I dnt no wat to tell her wen she asks me for advice please hlp