Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: I (a college student) recently met someone I have many mutual friends with, and I thought he was extremely attractive.  We hooked up on two separate weekends, and we both said we really would like to get to know each other better, so it seemed like more than physical at least from my side. Later he tells me he didn’t mean for things to go so far, and that he is “on a break” with a girl. He acts very regretful and somewhat shameful, but says we should keep hanging out. The relationship is scheduled to restart this week.  I also just found out that he previously cheated on his high school girlfriend at the beginning of college. 

We have a lot of friends in common and I don’t want to ruin possible tight friendships of his.  I have never spoken to the girl, AITA for not telling her?

Note: this is ongoing so I still have the choice 

not telling her I was unknowingly the other woman while they were on a break