Why does he listen to my conversations with others?

Anonymous
He teases me, stares at me, has made suggestive remarks in the past, he tries to make me jealous with his girlfriend. Even when he’s with her he’s eavesdropping on my conversations. But ultimately he started dating her. We went on one date last year and the way I handled it he took it as a rejection I guess as he told me. Anyway a few months later he met her but was still flirting with me. But he knew I liked him and he said “we’re friends right? I don’t want to hurt you” and since then he obviously has repeatedly hurt me by messing with my head and paying me attention in front of her. He even said in front of her that dating her was a lie and winked at me. He always says things to get under my skin and make me jealous. What he says and what he does contradict themselves. But even so these days we don’t text or talk much. I ignore him at social gatherings but he’s still trying to get my attention. What’s going on in his head?
Why does he listen to my conversations with others?
3 Opinion