I need some advice, I’m not sure if I am overreacting because of my past, but if I am right for feeling how I do. A couple days ago, my partner (M) and I (F)both had a large project presentation for college, and we set up our presentations next to each other. About twenty minutes before the event ended, a woman walked up to my partner and I having a conversation . For context, I know this woman, I’ve had a class with her all semester, she is a couple years younger than me and I see her once a week for this course. We aren’t friends, or even acquaintances, just together in a small course that you recognize everyone’s faces. I actually was in a group with her last week during the course, as the professor was reviewing for the finals and had placed everyone in small groups. Anyways, she interrupted my partner and I talking, and begun talking to my partner, completely ignoring my existence, with no acknowledgment to me. She interrupted our conversation, asking my partner to explain his presentation and turned her back towards me. Since I was in a crowded room with others standing around their presentations, I simply played in cool and stepped back and waited. Afterwards, my partner told me that he knew the girl, not very well but the last time he had spoke to her, she had talked to him and his old roommate mate a couple years ago, or a period of time that hasn’t been anytime recent, they had a class together or something in the past. I was just shocked, this woman and I have seen each other once a week for an entire semester, and worked in a small group just this last week, but she acts like she is old friends with my partner that she hasn’t seen anytime recently, yet ignores my existence? I was at least expecting her to at least say something along the lines of “Hey, aren’t we in this class together… blah blah blah”, at least any form of acknowledgment, and my partner himself did not include me into the conversation or introduce me as his partner. I understand that I could or should have stepped in and said something myself, but honestly I was being a shrimp, and wasn’t sure myself if this woman was just innocently asking about my partner’s project, or was doing what I think she was doing. I didn’t want to be rude if there was no reason to be. My partner has cheated on me in the past and I have permission to check his phone and his location, and I do not believe that he has been cheating on me with this woman, but I think the woman is interested in my partner. After this happened I just feel so angry and hurt. I do not think my partner handled the situation well, and I can’t believe he even entertained it. I honestly just want advice, am I crazy to be upset, is there anything to be upset about, and am I overacting about this woman’s intentions.