Why would a man avoid a woman?

In the beginning He was friendly But recently he started avoiding me (for instance hiding or Walk into another Directiob when he sees me) and giving me Cold Stares when He Walks past me.

He is still polite when I ask him work related questions But Makes a Long Face and sometimes avoids eye contact. I Never flirted with him and keep to myself Most of the Time so I don’t understand how I could have annoyed or upset him. With other female coworkers He is always charming and talkative

Why would a man avoid a woman?
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