Yep, I had the feeling with your use of "time to move on". I just wanted to add onto that.

I do get that beyond this analogy, there could be the concern of the US using Taiwan to stage attacks onto mainland China, in the CPC's collective mind. However, I don't think Taiwan would have remained as pro-US in the long run if mainland China wasn't constantly talking about taking it back, having enshrined that goal into their constitution. If they could let it go, both states would gain from it, as you also alluded to. It's a huge country of over 1 billion people, with an economy shooting up to the sky, and modernizing extremely quickly nationwide. Taiwan is not worth the sanctions and worsened relationship with Western countries, the way I see it.

If they don't want to be with you, they don't want to be with you. No matter the amount of history and years you had together before.

Countries need to stop being possessive ex-significant others. Trying to force them to be with you will just push them away further, and generally into the arms of another country, as they need to protect themselves.