Should I confront her or move on?

So recently I found out that one of my friends was talking to a guy that I liked behind my back for a couple of months (not every day but frequently) even though I have been open about my attraction to him (physically, fwb type thing) and it was clear and obvious that he was the same for me. Also it’s known that he doesn’t want a relationship anytime soon and she has a habit of going for guys who don’t want relationships. But I didn’t find out from her, I found out from one of our other friends and when I found out I wasn’t shocked because there was a situation where she was at his place with our friend (because our friend was dating his friend) but she was way too cosy at his place, like pj’s on his couch [he posted on his story, and you could see her there] even though she was there celebrating a mutual and wasn’t staying over. Anyways so I found out, and we’re probably going to hang out soon (as a group) and I’m not sure how to address the situation because although I don’t mind now, it really took a toll on my mental health and trusting and being open to people close to me.

[more info] Also she texted the group chat out of no where to catch up but didn’t ask the normal “hey, how are you”, she just went straight to “anyone in a relationship?” which was suspicious and weird since we all knew who was in a relationship and nothing had changed. It just seemed like she was fishing and trying to get a reaction.

- and we’re both in university