What does it mean when guy gives you a last glance before leaving out?

I saw a guy at church. I don’t see him too often.. but after church we were introduced for the first time. My moms boyfriend introduced us. he sees my mom and her boyfriend very often.

when we were introduced he gave me a friendly/light hug that HE initiated.. but maybe he felt obligated to bc he gave my mom a hug. He is very nice and my mom adores him

But before leaving out he glanced back at me. He was going up the stairs and before he put his foot on the step he glanced back. And my mother tapped me and said that he looked back at you

What does it mean when guy gives you a last glance before leaving out?
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