Does someone mimicking your body language actually mean they like you?

This is gonna sound stupid but

This hot dude sits by me in one of my classes(he doesn’t have friends in that class) and he always copies how I sit and write. If I lean back, he does too. If I have one hand on the table and one in my lap, he does too. If I mess with my pencil, so does he. He also glances at me quite a bit

My friend sits on the other side of me so we usually talk, and I don’t talk to him much

Anyway, is that just something dumb or is it true?

I can’t really see him liking me, he’s really popular and cute and I’m a 5-6 at most lol