Your expectations are pretty high if realizing this led you to be disappointed. Not expectations of your SO in particular, but in general about people.
I think this is inherent to most people - they generally don't enjoy the job they do, but they do it still to pay the bills and secure for yourself some form of retirement and safety net in your later years.
EDIT> But also, I generally don't do any job whose subject matter I don't enjoy. I'm different in this way, from most people. The concept of doing something that I don't like is very foreign to me, with all the positives and also negatives that entails.