What does it mean if an ex tries to make you jealous intentionally?

Anonymous
Okay, I know the whole ''it only works if your jealous'' but his schemes are hilarious and ridiculous anyone can see it. we were in class and this one girl that liked him was talking and he would out of nowhere laugh obnoxiously loud. Like it was forced. One day, my books dropped and as they dropped one of his friends picked them up and helped me. A few minutes after that VERY LOUDLY (Notice how I keep saying loudly) he talks to this other girl. It's like he tries to get my attention. Now this girl, she is special. Prior to this incident and after were split, there was a group chat made. When he was added, he started flirting with her. When we were dating, he know I got easily jealous. My point is, he is not ever loud and obnoxious. He's the "Chill" type. So why would he do this?

Bonus (His behavior around me):
-His behavior is strange. If I'm talking to a male classmate, he would look at me. My friends and I were talking about our old classmates and we were talking about a few boys (not romantically) and I didn't even notice he was there, and when I looked up he was there and he looked kinda sad. Now he could've been sad about anything, but prior to my friends were talking he was in a good mood. One morning, he comes to a place where I always am at. He knows I'm always here. He comes up there and lingers around, but this time with his back turned away from us. Why did he do this? Sometimes it seems as if he is timid and shy, why is that the case?
What does it mean if an ex tries to make you jealous intentionally?
4 Opinion