Guys, If a guy greets you enthusiastically with both thumbs up and a sfriendky smile when you cross his path, could it indicate he's attracted to you?

For context I'm 23 (f) and there's this guy in my college class who I'm friendly with acquaintence wise but we're not friends at all, yet the other day he greeted me like this...

Guys, If a guy greets you enthusiastically with both thumbs up and a sfriendky smile when you cross his path, could it indicate he's attracted to you?
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