I like the advice given so far... I have been stung with this one.
My husband and I dated a man that claimed his wife knew for about 6 months. It turns out she thought he was just having casual sex, but he had fallen in love with me. he tried to get me to continue behind her back and with many concessions and disagreed with it and said he had to tell her. He did and broke contact from me immediately. Or she did, on his behalf, I don't know.
It sucked and I still have a bit of a sting in my heart over it. I will never do that again. I will always ask to speak with a partner first now as a result and before anything goes beyond flirting.
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