Guys explain why you "side hug" a girl?

This guy I had a one night fling over a year ago met up at an event. He seemed preoccupied with his phone the short time we hung out. I thought we'd hang out after the event. He walked me to my car and gave me an Awkward side hug... I'm so confused 😕.

A year ago we hooked up, booze was involved. This round we did a day time activity.
Guys explain why you "side hug" a girl?
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