I saw a hot girl in Orlando, tall with perfect breasts. She worked as a secretary and provided on the side. I asked her if she ever did her boss. She said a few times. I asked, did you know his wife. She said yes, she was hot and also nice.  
For some of reason, it struck me as extremely erotic that this lady could carry on normal conversations, with his boss and his wife, the 2 of them knowing they had fucked.  I just wonder what went through her mind?  
Any girls had this experience?  Was it extra hot or normal ?

... did the wife know her husband was fucking his secretary? And if so, was a threesome ever contemplated?

You have apparently led  sheltered life.

did you find out she provided on the side?

As I've mentioned the wife had fucked a couple of our neighbors. But, so had I.  When things get a be sticky, you do not always want to just move if it is a good neighborhood to live in and you like the house. Time usually lowers the heat and life goes on.

I'll let MetsFan confirm or deny, but when I read, "I saw a hot girl in Orlando," I assumed that he saw her as a Provider, not a secretary.  
.
EDIT: Oops! I replied to SteadyAlways by mistake. This was meant to be a reply to holystonethedeck. Trying to edit w/o moving. I hope this works.

...like that what is to be expected? Would you have been happy with a "No...she never did that" response?

I think the OP has indeed lived a VERY sheltered life.

a bit more closed mouth but playing for ever, probably.  My dad after retiring from the military and had a decent civilian job with secretary was fucking said secretary regularly. My mom apparently did not care as she was doing some guy on the side also.  How do I know? Good question. Overheard conversation and in their later years they kind of let their hair down and spoke about their marriage and the other people they knew. And came across, both, as a bit proud at the number of people they had sex with and still stayed together. No, they didn't say I fucked him, her, or such. But the meaning was very clear.

Since he didn't admit to smoking it he could hardly accuse me of stealing it.  

Mom was smoking pot before dad started.