Why would a guy constantly touch my hair?

i have this guy friend who randomly touches my hair sometimes when im talking to him. MY hair is always in a ponytail. When we first met he texted me that he wanted to touch my hair but didn't want to be rude but i told him he could. So since then he is always randomly feeling on my ponytail lol when im talking to him.

Why would a guy constantly touch my hair?
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