<human>: Condense the text into a few key points

Okay so she's 18 f I'm 19 m. Relationship is not even a month old yet. She was in a relationship for a year with this guy and she had some troubles with him because I'm in a fraternity and we had mutual friends. Well this frat can get pretty rowdy and she's hooked up with guys in front of her (now ex) boyfriend. Needless to say, he was not happy about her going there. Anyway she cheated on him with me and four days later we were dating. Is this relationship doomed to end, is it a major red flag that she shouldn't be trusted?
<bot>: girl has cheated on her bf in the past, cheated on him with me, and now we are dating, is this a major red flag about her ability to be trusted? am I just a rebound?