Why would my crush do this, he put both thumbs up and gave me a big smile?

My crush did this: As I was walking past him, he turned towards me and asked me how I was and then as I was leaving he said bye, with a big smile on his face, staring into my eyes deeply and he put both thumbs up and he had a massive grin on his face, almost as if he was trying not to laugh!

Is he making fun of me or does he really like me?
Why would my crush do this, he put both thumbs up and gave me a big smile?
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