All input are making sense and valuable but let me be a little mor detail so you can see why she came up with the idea.
At first, she love (the look) of the car, knowing 911 has always been my dream car and nothing else can be better. For a while, she was always there for the 911. When I DIY, she's there to help handling tools and such. When we went out, I am happy driving it. She's happy riding it knowing I love the car.
After a while, experiencing several incidents such as slave cylinder went dead while we were on the way to a friend's wedding. I was driving without clutch that night and we got there really late. And I almost got into a fiight with a bunch of idiot who was horking, reving, showing finger at me while I was having trouble shifting, with my emergency lights on. Although I could manage to get us home safe, and no damage to the car but still... then the starter issue came up. And then the Alpine alarm issue came up. Then alternator came. Then the AC issues... and ect. These are only major issues. There are little things here and there. Also, I often like to "hug" my cars when even nothing wrong with it, and use "repair" as a reason
And again, as someone mentioned above, I slowly spent more time with the car. We used to do things together but now instead of family even on weekends as usual, I rather "repair" my car and ask her to go with others. Well, I should take more responsibility too. But... who doesn't want his car to run/perform a little better if he loves his car. Right? Especially this board is so active. Everytime reading something new, and there always something new, I would just want to have some time to do it right away.
Another related reason is as someone mentioned above, we are thinking about changing home. The first thing I look is bigger and taller ceiling garage. My reason is preparing for a lift in the future. And bigger backyard, also for the future, if I can afford my own repair garage. To us, this is a little hard, especially in SCal. Beside the garage and the backyard, who cares. Then she was "huh? all you care is the garage?".
No, she didn't push me to sell it. She just had an idea "maybe you get a Lexus so you don't have to fix it all the time". To her, it's good for both, me and the family. But to me I must have it, just that it needs a little more than usual attention. Or maybe it doesn't, but I rather say I paid too much attention to it. My conclusion, no more thought about losing my car. She stays.
Thanks guys.