A colleague that I’ve known for a few months, so sweet towards me started giving me random dirty looks on the same day?

A colleague that I’ve known for a few months, who I see every so often was getting use to me. We didn’t talk as much at first but I could see him in the corner of my eye gazing at me with a smile. Slowly as days went on we’ve started to get to know each other slightly. Just the other day he was soo smitten by me and then suddenly at the end of the day when I’d ask him something he would give me dirty looks. I don’t understand, someone help?

A colleague that I’ve known for a few months, so sweet towards me started giving me random dirty looks on the same day?
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