The room went silent, and Sarah turned red but laughed it off, saying, “Tom and I are just comfortable with each other. No need to be insecure.”

Tom works as a project manager at a tech company, and Sarah joined his team about two years ago. Throughout the night, Sarah kept touching Tom’s arm, bringing up inside jokes, and sitting across from him with intense eye contact. After spilling her drink, she insisted on cleaning it up, despite Tom looking uncomfortable.

At home, Tom was upset with me, saying I embarrassed him in front of his colleagues. He claimed Sarah is “just naturally flirty” and I need to trust him more. I told him he was being naive and that he was either blind to her behavior or enjoying it. This led to a huge argument. The next morning, Sarah emailed me apologizing for the “misunderstanding,” but also calling my behavior “territorial and unprofessional,” copying Tom and his supervisor.

Now, Tom is sleeping in the guest room, claiming I’ve made his work situation awkward. His colleagues’ wives are texting me mixed responses—some say they’ve noticed Sarah’s behavior, others think I overreacted. Am I wrong here?