Why did he touch my hip?

We have a crush on each other, we're colleagues. And yesterday he tried to make it seem like he was just walking past next to me, so others didn't notice, but with this hand he touched my hip (felt like it was pretty close to my...).

(Okaaay, maybe we shouldn't do this at work, it's common sense, but it isn't what the question is about)

We flirted before but he never touched before like this, maybe just my shoulder.

Why did he do this?

Why did he touch my hip?
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