I was in a similar situation with a girl from the south that i came to Taiwan for. We met and lived abroad, and then I moved here for her. Things changed a lot when she came back. She changed a lot. We were together 6 years. Everything i did was never good enough for the family, who was boring as hell and dysfunctional. They were blue, rich, and budhist, so not the easiest to deal with.
Ultimately i understood she would not put me first in her life, in front of her family, when I had given up everything for her. So we ended it, peacefully.
In my current relationship, I'm luckier. She has stood up to her parents, actively disagreeing with them. I have encouraged her, sometime even pushed her in that direction. She has turned out happy with it, and the results for me are pretty good. She wants to spend time abroad.
I'm no longer easy going with older Taiwanese people. It's only a one way relationship the way they see it. I'm polite and do my best to give them face and social status signs that make them feel safer, but I insist standing on my limits when they go too far (which they often do). I no longer accept special reasons, special cases, and excuses like I did for so long in Tainan. In my opinion old people in Taiwan are often capricious and irresponsible, pretending what they do is about respect, tradition, and humility.
If you ask around, you'll find insane stories of morale abuse between older and newer generation, in-laws and bride/groom in Taiwan. Be careful not to be the next one.