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.
Q: It just doesn’t sit well with me that she went back to her old fwb. she was doing this with him right up until we met. 

AITA for feeling like she was doing things with him during our relationship?

A: 
getting upset that my ex went back to her old fwb after we broke up