Stay strong, Bertie, you know where you are now, and most importantly, you have made up your mind.
I am in a very similar situation. There have been countless opportunities over many years for him to make it right, with my understanding and support, all ignored/his 'efforts' lasting a few hours.
There comes a time when you don't 'believe' anymore; your heart has been ripped out, your loyalty and commitment made a joke of, you finally see it, and know it will never be any different. Time to move on, and not be swayed by too little too late.
If he expects you to rearange your life (ex. Re. Work commitments) in order to prove he is changing, ( and compromise your financial independance by the same token, btw) well, it just proves he isn't changing.
Take care of yourself, 1st.