<human>: Can you give me a shortened version of the text?

This seems like a straightforward issue, but it's not...

5 years ago, my best male friend (call him John) moved to my city and I introduced him to my best female friend (Julie), thinking they'd hit it off.  That very same night, Julie told me that she had recently started working as an escort.  I didn't think the prostitution or their relationship would go anywhere, so I didn't mention anything to John, but instead tried to convince her to tell him.  She wouldn't, and after a few months of dating (and living together) she told me she'd stopped escorting.  I decided it wasn't my news to tell him, and moved on with my life.

Then, two years ago, they invited me to witness their marriage.  I again asked Julie if John knew yet, and she said that he wouldn't want to know, and that she hadn't done it in ages anyway.  I believed her, and told John that I couldn't witness their marriage in good conscience.  He didn't ask why.  

Fast forward to now - I haven't spoken to Julie since they got married.  I was in their city recently and hung out with John.  He told me about Julie's current "job", which sounded very fishy so I googled her old escort name and found evidence that she was still working at least until March 2013, almost one year into their marriage.  Knowing John and how he'd react to that news, I doubt that Julie's told him.

I still feel like it isn't my place to break this news (and most guys I ask seem to agree with me), and I don't want John's life to be ruined, especially if Julie's no longer doing it.  I don't know if she's still working, but I do know that she lied about it to me and to him for a long time.  At the same time, I feel horrible about letting John live his life like this.  

Any thoughts on what I should do?
<bot>: My friend is married to a prostitute (who I introduced him to) and I don't think he knows.  What should I do?