Any machine is only as good as it's mechanic.
For a reliable bike, you have to amortize the proper work given to it throughout its 30 years of "life". From that, you have to reverse all the shoddy, improper work, or "previous owner enhancements" done to the machine. There are few bike modifiers that are as talented, thorough, and successful as the Honda engineers.
Once you have the bike in near new or restored condition, you can ride it 3000 miles between routine service intervals, and years before doing anything else.
Having said that. A day spent reversing 30 years of corrosion on the electrical connections and component will go a long way towards the key switch have direct control over machine life.
I used my CB550 for 20 years as a reliable commuter. Yes, there were times I had to take the car, or the "spare bike" due to minor issues that needed and 1/2 to 1 hour attention. As I got better at the skill of diagnosing and repair, the repair times got shorter. And, the reliability of the machine greater.
Short sermon...
Your girl may be testing you to determine her importance in your life, and how much she can control what you do and enjoy. It sounds like she has already made you feel that working on the bike is a bad thing. And that the end result and the skills you are gaining are meaningless to her. Ask yourself if she will EVER let you enjoy doing something you feel is worth while doing by your own reasoning. Ask why she is not supportive of YOUR interests and expansion of your knowledge base.
If she is "managing" your attention toward projects that she finds important, beware of being a kept man. If she wants you to be a couch potato with the clicker in hand, ask your self if that is the life you want.
My wife was happy that I was in the garage instead of the bars carousing. She could come out to the garage and visit or participate any time she wanted, and put my tools away before I was done using them.
She also was amazed that I could fix her vehicle when it broke using mechanic skills garnered in the garage. She valued that more than me paying for someone else to fix things, though being a high wage earner.
Finally, if you are "fighting" with your bike now, it will forever be an adversary and never a friend. Ask yourself how that relationship was formed. (didn't you like it when you got it?). Sounds like she has already succeeded in placing the bike in the dislike category even though she knows it has sentimental value to you (not her..why does she not value the things you have or do?). If she will let you have a motorcycle at all, ask which one she will let you have, sell the one you have now, and buy the one she approves of.
Cheers,