Why would a Male coworker Go out of his way to avoid me?

Two weeks ago I Started a new Job in a friendly Team. The First day I felt like my supervisor was slightly flirting with me.

Now however when He knows that I will be in the Office He looks for excuses to disappear and Not See me. Why could that be? I Never Made any advances towards him.

Why would a Male coworker Go out of his way to avoid me?
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