Why does he avoid touching me?

As the title says, there's this guy in my friend group who treats me differently than the girls in our group. With them, he'll touch their shoulder, knee, arm... but he's never touched me.

He doesn't dislike me I've asked other friends in our group and they've relayed good things he says about me to them, but why won't he touch me? It makes me feel like he's repulsed by me.

Why does he avoid touching me?
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