Why did my crush and his current girl want me to know that they are dating or hooking up?

Anonymous

My crush (we don't talk) used to have a crush on me for about a year and awkwardly tried to get my attention which I ignored because I was convinced he had a girlfriend at that time (he posted vacation pictures with a girl on instagram). I'm pretty sure he liked me or was at least curious about me because his friend was staring at me and tried to ship us once.

Now he met a girl in a course he does a project with and they were very flirty, loud, smiley and enthusiastic from the very beginning. I was a bit taken aback when I saw him interacting with her so smoothly and overly flirty since he was always very shy and awkward with me and he couldn't even find the courage to talk to me.

After that every time I saw them in the lecture they didn't make eye contact, greet nor exchange words or sit next to each other so I thought there was not much happening between them. However two days ago they suddenly seemed a lot closer and he was invading her space and lingering very close next to her as if he was about to kiss her and acting all cutesy while occasionally glancing at me. I was sitting in the row behind them the whole time since the girl chose to sit directly in front of me.

I feel like they both dig each other and also want to shove it to my face. But assuming I'm right, why would they want to do that and how would she know that I used to have a crush on him?

Why did my crush and his current girl want me to know that they are dating or hooking up?
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