Once the girl breaks the touch barrier, does the guy get the clue that she likes him? Do you reciprocate back?

Question says it all.

If you like her, what do you do? Are you a little hesitant at first?

If you don't like her, would you still touch her?

I am talking about a girl touching the guy's arm, back of shoulder, grabbing his wrist/arm/hand, neck.
Once the girl breaks the touch barrier, does the guy get the clue that she likes him? Do you reciprocate back?
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