Doesn't sound like you're married either, quite frankly I0540!
Been there, and never again. I would not be flying if I still was, thank you very much.
I fly with my girlfriend a lot; done trips to the far reaches of European avgas availability and legs up to 6 hours. If she was PIC, I would treat her the same way as I treat any other competent pilot in a single crew cockpit. Leave her alone to do the flying, help out if asked, or if necessary.
She doesn't have a PPL but I am going through the basics of what is often sold as a "co-pilot course" with her.
RESPECT is the key word.