Accidental touch or intentional?

I was sitting at my desk on campus working on the computer and this guy I know came to help me with something. He crouched beside me to use the keyboard and as he moved his arm away, him arm grazed my thigh. Then it happened a second time. Could it just be accidental or is this rarely the case? I was also wearing a nice dress that day and we've been mildly flirty in the past. What do you think?
Accidental touch or intentional?
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