You remember how they tried to drive out of echo in the van, right? (In the Leo timeline)
I too made the decision to break off with Leo, because he's become psychotic. I had a feeling it might take away his hope and purpose, but I just did not want to lie to him. It was his decision to stay behind, after all, and the relationship had already died at that point, and taken a backseat to pure survival. It was heartbreaking! But as such, a good example of the writing that nearly broke my mind, although along with other things I was experiencing as well, at the time.
Oh no.. that's horrible. Did he survive?