Guys, my engaged male friend and I have recently become close, and he once told me "biggest mistake was being introduced to you"? what does that mean?

this friend and i have become really close recently. we sort of have a flirtationship. once we were talking, and he said "biggest mistake was that I was introduced to you. that we met". what does that mean? is it cause he's engaged?

Guys, my engaged male friend and I have recently become close, and he once told me "biggest mistake was being introduced to you"? what does that mean?
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