What is this behavior?

The guy knew I had a crush on him when he tried to make me jealous. He would always reply one word to me in text. He would always stare at me from far with sad eyes. Everyday. His friends would tease him with my name. Sometimes he would comment on my pics. We know each other from school. I would always avoid him. He always try to get my attention. We were childhood friends but now we are more like enemies.
What is this behavior?
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