but I know in the end I will come out of this better off than her
It is not about being better than HER.
It is about being better than YOU WERE/ARE.
It is not a competition. Ditch the scorecard as 25 says.
Listen to Grit. His words have helped me more than you know through this. This about working on YOU. YOU taking control of YOUR life. Being THE MAN you want to be/truly are.
BITS
Happiness is not something ready made. It comes from your own actions.