Is NOBODY wrong in the post ? POST : Grad student here. Our class size is small, so we get to know our classmates well compared to other grad programs. Since we started seven months ago, I've noticed one of our married students (Sally) hanging out a lot with another guy in our class (Jake). Sally's husband (Terry) is back home working, and they've been married for over a year. 

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Sally and Jake always sit next to each other in class, walk between classes together, and even hang out just talking when class is over. When they hang out, they talk for about an hour, sometimes more. Their body language when talking is usually flirtatious. For example, Sally will sometimes punch Jake in the arm when laughing, or they'll get super close when showing each other something on their phone. Other times, their conversations appear more serious. I first noticed them hanging out five months ago, and they do this 4-5 times a week. I also saw them on a walk together late at night, and they often go to the lab together outside of class.

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A couple of my close classmates have also noticed their behavior. It became super obvious when Sally and Jake recently practiced one of our clinical skills on each other for two hours during class; everyone else was able to get it done and swap partners after half an hour. We started making inside jokes about them and will take pictures of them together as a way to confirm our theory.

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It's bad enough that I wonder if I should send Terry a message (anonymously) saying that Sally may be emotionally involved with her classmate. It takes a lot of trust to spend months at a time apart from a spouse, and from what I've seen, I believe Sally is violating that trust by spending a lot of time with Jake. If I were Terry, I'd want to know if my spouse may be emotionally involved with someone else. Also, If I were Sally, I wouldn't spend one-on-one time with someone of the opposite sex nearly as much as Sally is.

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AITA if I send Terry an anonymous message with a couple of pictures telling him Sally may be involved in an emotional affair?