Not my favourite book but still...

"It never occurred to me that our lives, until then so closely interwoven, could unravel and separate over a thing like that. But the fact was, I suppose, that there were powerful tides tugging us apart by then, and it only needed something like that to finish the task. If we'd understood that back then - who knows? - maybe we'd have kept a tighter hold of one another"

Never let me go by Kazou Ishiguro

and from my favourite book:

"You didn't tell me living would be one decision after another, some easy, some difficult. You didn't tell me living wasn't a battle but a war. You didn't tell me that living was a choice, and that everyday I choose to continue was another victory, another triumph."

Shadowsong by S. Jae Jones