What are signs a guy is trying to make you jealous?

Anonymous
So this a guy that I’ve been on and off again for years. He appears to be recently dating someone new but I don’t know if it’s serious or he’s just trying to annoy me. He last reached out to me around 3 months ago asking to see me and then started dating this girl a month after that.
What are signs a guy is trying to make you jealous?
2 Opinion