Why does my boyfriend try to make me insecure?

A little background, I'm a pretty attractive girl, who is ambitious. I get male attention and guys never just want to be friends with me. When we first met I was so confident, and he was pretty insecure even though I reassured him that I was only into him. But as time went on, he keeps trying to make me jealous and insecure, always mentioning other girls and making "jokes". When I ignore him, he tries so hard to make me notice him, sometimes taking out my AirPods, or talking in a loud voice and repeating the joke several times. Now I started to realize I'm really insecure and get jealous easily, and the confident person I was once before isn't there anymore. Why does he make me so jealpus?
Why does my boyfriend try to make me insecure?
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