To start with, my friend (f16) is very unstable in relationships and this past week she really impressed me. She broke up less than a week ago and at her school she started getting even closer to a boy in her class. It started with conversations and caresses. Yesterday she told me that she had kissed him and the people in her class saw it. So today they asked him who he was dating and surprisingly he revealed that he was dating a girl who is not my friend. He said this in front of the boys in her class to make my friend feel inferior. After all, my friend still sent him a message after class saying that when he broke up he should let her know. Like, wtf??

I even understand that she kissed him after all she was single (even though I disagree since she broke up a week ago) but she still sends him a message asking for this... I'm angry about this whole situation but she's my friend above all that, so am I a bad person for feeling disgusted with her? She took part in a betrayal and won't even warn his girlfriend...