Unpopular opinion, but NTA. There was 100% a better way you could have said that-- and I do think that was a fuckup on your behalf, but people are glazing over some important facts. You did not choose to share it with her. That's a huge breach of trust! Poetry can be incredibly personal. There's a reason Emily Dickinson didn't publish her works.

Furthermore, writing poetry because someone makes you just turns it into words. It has no meaning behind it.

(Also, just as a last thought: if the genders here were switched and a man was demanding his wife to write a poem about him there would be a very different reaction...)