You have to work on yourself for yourself. It is the only way to get through all of this. We are all here to save our marriages, and have all made mistakes and I, for one, continue to make them. I try to learn from them and not repeat what isn't working.
Do not tell her how hard it is without her. She knows this. Let her think you are OK. Next to impossible, I know, but it does work. It is hard to do but you must do it!!!!
Stay strong and become a better person no matter what she decides.