Did you not read the intro on this game?
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It was already clear from the get go that their expectations and actions in regards to this activity would diverge at some point. It had all the telltale signs of her going to go further/faster than he anticipated and perhaps liking it a lot more than he does.
With what's released thus far it's not entirely sure if she is sorry for going further than he expected and not not telling him or perhaps she thought he was still watching as it was a livestream?
In regards to the boss having the data, could be she sent the data with the idea of teasing the husband later on OR he installed something on her phone without her knowing, that hasn't been clarified either.
Hard to tell since it ended on a cliffhanger.