H still living in home but cheating

[abbey1989]

Question:

What would you do in my situation?

I was thinking I could let H casually know that I know that OW works at my college. I could casually ask...."so how is OW's new house project coming along?" Make him squirm since I found that his name is the contact on a few of the permits.

Last March, around this time when I saw an email on his computer (I wasn't even snooping....I was working on some marketing materials for him) regarding OW's house, that was the last time I asked him flat out....ARE YOU BUILDING HER HOUSE? DO YOU STILL SEE HER? He denied, and said that if he was building her house I would know about it because I do all of the paperwork/billing. He is probably just consulting with her.
Again, he accused me of being distrustful and that I always think something is "going on".

He doesn't know that I know that he is involved with the project. Just confirmed that on Monday when I looked at public permitting records.

OR...

I could ask how is his friend (OW) doing? Do they still speak? How is her new house coming along?

OR...

I could keep my mouth shut and carry on?

Do you feel it is lying when a H withholds information? He knows I would be upset if he thought that I knew he was still seeing her (for whatever reason). But the fact that he left that message for her on my cell phone by accident, saying "hey babe, I'm at xyz school down near the cafeteria", it kind of ties it all together doesn't it?

What would you do?