I don't understand your post.
You and your wife have been together long enough to have adult children, and she has lived in the same house she was brought home to as a baby, except for the last 6 years. So you married her and moved in with her parents all your adult life?
What's financial infidelity? I can't even guess.
This is kind of an odd post, after some 25 years of marriage. It sounds like you've been with her a couple years, and are learning her personality.
If a person wants to have an extra marital affair he/she will do it no matter where, whether moving or not. Ten miles is not really that far away.
You say the eye opener for you was texting on her cell, and all night PC time. Do you happen to know if she did text messages with another man? Speculating can drive you nuts. Can you find out who she text message with?
If she is up all night, who looks after your 22 month old baby the next day?
I am confused. You posted on here regarding another topic. If you don't trust your wife, then something needs to be done. Moving has nothing to do with anything, because you didn't move very far away.