So I ended this affair relationship after she went on a trip with her girlfriends and I found out, through her giving me access to her email and social media, that she fucked another guy while away. She didn't remember giving me access and doesn't know how much I know but she is basically upset about me treating her like shit. I haven't treated her like shit but I don't entertain her anymore and she is reacting poorly. I'm not sure if I should show her the screenshots of the fact that I know she fucked another guy or if I should just ignore it and move on? I work with this woman and have to see her somewhat often.