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"why didn't you make these changes last year?".

Textbook WAS behaviour. They want THEIR decision to be YOUR fault. You working on yourself is inconvenient to their narrative.

Your Option A Response: “You’re right, I should have made these changes last year oh perfect one, but I’ve changed now, can we work it out and try again?”
Her translation: He obviously still wants to be with me, so it must be fake changes. I’m clearly making a smart decision.

Your Option B Response: “Oh well, we don’t always get what we want in life. Anyway, can’t talk, I’m off to the gym and then I’m going out with friends to a party.
Her translation: What????? He doesn’t give a sh*t and seems really happy. I can’t stand not having him begging and pleading like a puppy dog. Perhaps I’m making a big mistake??

This is how the brain of a WAS works. It makes zero sense, but what cha gonna do?

Get busy living!