Walter in “Unfinished Business”

Walter

I realized at that moment that despite what I'd promised, what I fully intended to do, that I could never take Peter back. The way she looked at him. I saw in her what I feared most in myself when I saw him: I couldn't lose him again. It was the first hole, Olivia. The first breach. The first crack in the pattern of cracks. Spaces between the worlds. And it's my fault. You can't imagine what it's like to lose a child.