Recovery Timeline

I am assuming this timeline is for the couple that didn't separate and the "why" of what happened has been addressed and fixed quickly. My husband and I separated and didn't decide to work on us till 4 months after D day. Then I found out what happened over time and even up to a couple of months ago. And now the "why" of the affair isn't easily fixed by my husband. How does a timeline look then? What if the "why" can't be fixed because it is so ingrained in his being? I feel so discouraged looking at this timeline.