Why does he avoid touching me?

He has NO PROBLEM looking at, facing, or casually touching/being touched by other girls! Me? He stiffens, I only talk to the side of his head and he jumps when I ACCIDENTALLY touch him. He'll joke with me, say sexual innuendos to me in a low deep voice, tap his knee or fingers too. Without thinking he'll go to tap me and then suddenly realize and then stop himself awkwardly.

What is going on? I feel like an ugly toad or something. This happens only to me too.
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Also, I notice that when we get SUPER close, (he texts me all the time or quickly responds to me), or his sexual innuendos are non-stop, he SUDDENLY pulls back and stops talking to me, texting me, replying. He keeps going back and forth!
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And I guess he missed me?goofy night tonight and we both left and text eachother silly little things. He is a mystery!
Why does he avoid touching me?
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