Why does my 49 year old male coworker constantly say things that insinuate that I miss him or he misses me or I’m happy to see him?

Anonymous

My male coworker said ‘I didn’t mean to make you sad by leaving work so soon today’ on his way out and when I shrugged my shoulders and looked down to show sadness he was amused and happy. Why does he always insinuate that I miss him? But never asks me out?
he also loves to say ‘you look happy today. Or are you just happy to see me?’

Why does my 49 year old male coworker constantly say things that insinuate that I miss him or he misses me or I’m happy to see him?
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