For what reasons would you turn down your partner flirting with you?

For what reasons would you turn down your partner flirting with you?
Pr0tip - don't answer "I never refuse", your post will be deleted.
Thank you for understanding.
Updates:
7 mo
For me a good reason would be that I'm in a really bad mood, that my office closed down and my career is probably over, that my life as whole seems to be finished and I don't want for her to "take care" of me.
7 mo
We started to discuss, I flipped her off with all her "feel good" crap and took the car.
Now I'm on the side of the road, ignoring her calls and texts.
For what reasons would you turn down your partner flirting with you?
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