Yes, my father and stepmother.
They have been married for 15 years, and are perfect for each other.
He cheated on my mother with her for YEARS.
My sister and I didn't know anything about it, and my mother kept it that way.
We both like our stepmother very much, and she didn't want us to feel guilty about it, so she made sure all his dirty little secrets remained that way.
Now that I'm grown and know everything, I feel so sorry for my mother. She really suffered a lot for the sake of my and my sister's happiness.
I respect her so much.
I love my father and stepmother very much, and did deal with some resentment issues after everything was out in the open. We have worked it out, but I will NEVER respect either one of them.
Thankfully she remarried and is happier than she ever was. So I guess in this case it worked out for the best.