How would you feel if the person you were seeing was actually married and you didn't know?

How would you feel if the person you were seeing was actually married and you didnt know?

Back then I was young and stupid, and had a short relationship with a woman who was an associate of my father. She was attractive and (claimed to be) separated from her husband and on the road of divorce.

What she actually meant by "separated" is that he was abroad for a year or so. In the end she wasn't even that interested in me, she just used me to get some advantages and at the end of it I kept quiet for the shame and worry about my father's reaction about it - only to discover after he passed that he knew, and the woman's husband knew too.

How would you feel if the person you were seeing was actually married and you didn't know?
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