My husband's best friend is giving off weird vibes to me. I've caught him several times staring at my eyes, when I look at him he looks away?

The last time he was staring at me, I caught him then he smiled at me. What is happening? He is also married and we hang out a lot together with our spouse.

My husband's best friend is giving off weird vibes to me. I've caught him several times staring at my eyes, when I look at him he looks away?
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