What does it mean if my crush pulls my ponytail?

He was walking to seat in class, and He pulled my ponytail while passing me, and I turned to him and he was grinning at me. We are not friends but we have talked. And then a couple of months later when I didn't see him for a while, he would look at me as I passed by. Why did he pull my ponytail and why did he look at me as I passed by several times?
What does it mean if my crush pulls my ponytail?
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