Why does this married guy flirt with anyone but me?

He flirts with all the women in our office but me even though I resemble his wife the most and he doesn’t plan on leaving her anytime soon. While he is flirty and goofy with everyone else he is very reserved and short with me. I understand that I might not be his type but why did he marry his wife then in the first place?

Why does this married guy flirt with anyone but me?
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