If it was just fucking then why bring the boyfriend to meet your parents? There is a seriousness there. He sees her as more and vice versa. To bring a man home who admits he is married and is fixed so no kids will be involved is an in your face move.

I mean does she not care what people think... NO no no. You fuck a married man in private without telling anyone. If it more than that then she is a mistress and he is keeping her for himself. They are bold about it.