If you DID say you believe in honouring commitments in your FT session then DO IT... be committed to a healthy life for yourself and protecting your dignity thorugh your marriage or divorce...
Surrendering a battle with "I'm done" isnt' giong to make YOU feel any healthier a few days from now.. you will just feel miserable and exploited and most of all BULLIED
Be done when the marriage is done if you want... If you end it sooner in your heart than the divorce date then you are just surrendering to a bully and you will regret it years from now.
End it well, end it on the time it is scheduled to, and stick to your commitment.