It might be because he hates his job:
The main finding showed that flirting at work was negatively related to job satisfaction for men. There was no significant relationship between flirting and job satisfaction for women.
And it’s not going to make the job any better for him:
Chadi said: “Claims that flirting at work can enhance career prospects, bring success and improve job satisfaction are common, but largely un-founded with no supporting evidence.“
Source: Science Daily
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