She didn't file because you refused to move to the apartment. I hope you know that nothing you did or didn't do contributes to that. You set a boundary for yourself.
She was ready to file. She is just using your boundary as an excuse to absolve her of her own guilt; it makes her feel better to know that "you" caused this, not HER own actions.
These are the mental gymnastics WWs play with themselves to keep them from seeing the truth.
gaslighting is a REAL thing here. The scariest part is that they do it to themselves as much as to us.