If he is interested in me why does he act standoffish in WhatsApp?

This guy is giving me so many mixed signals for years. He blatantly stares at me on purpose after finding out about my obsessive crush on him through a friend and would turn away disappointedly when I don’t look back at him. He and his friends would keep an eye on me to see if I look at him. Once he turned around to stare at me, then stood up and stared at his friend as if he wanted to approach me. He would listen to my conversations with others and stalk my friends on social media.

A year later I found his number in a WhatsApp group and messaged him to ask him about his studies. He read all my messages immediately and replied very friendly until I asked if he wanted to talk to me because of his staring. From then on he was a bit rude and denied everything. I implied that I liked him by admitting that I too stared at him quite a bit. When I asked him why he didn’t approach me he answered „ah I don't know, I guess I was never that interested.“ I ended the conversation and he never texted me back.

Does he like me or not? If he likes me, why is he being so standoffish? And if he doesn’t like me, why is he so desperately trying to catch me looking at him and teasing me with his prolonged stares?

If he is interested in me why does he act standoffish in WhatsApp?
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