how can you think you're not "good enough"? anyone is "good enough" to be a married man's bit-on-the-side.
is that all you want from life? he won't be with you for Christmas, his birthday, possibly your birthday, anything that clashes with his chosen other life.
I tend to think of a mistress as vulnerable, not thinking straight and someone who has drastically lowered their standards... At least that's how I saw myself as a mistress. I think I'd rather be single.
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