People I need some comments on this it is seriously a wtf?

So my fraternity plays this game that if the pledges find an active alone at night they are allowed to "haze" them for 15 minutes. Its really a lot of fun. Well anyway this girl I have been dating decided to help the pledges get me. She said come over and hang out I went over there.. and the pledges opened the door....ya.. anyway when it was all over I tried calling her and she wouldn't anwser then she had some guy anwser (laughing) saying he was her bf..(i know the guy he clearly isn't) he had taken her to get a drink for helping them get me. When she got back she saw me waiting with her locked out roomie and ran away and drove away. when she went to drop the key of to her roomie she saw me coming and sped off even though I texted her telling her I wasn't mad.. I just wanted to talk to her.. you know give her a hard time. the next day her roomie posted a thing on her facebook saying idiot boys drama .. she responded with how it was for a good cause but now she is worried she will be torn to pieces and then told a pledge the same thing when they sent her a thanks for the help message. then today I was walking across the street and she was he first car waiting and I waved at her and she just put her arm up when she saw me then sped off .. wtf...someone help explain this