Who said "I could have stopped it."?

This quote is attributed to Rachel Watson.

I could have stopped it. - Rachel Watson

"I could have stopped it."

Rachel Watson

Character in The Girl on the Train

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"I have lost control over everything, even the places in my head."

"Every day I take the same route, I see the same things."

"I'm nobody. I'm nothing. I don't exist."

"The thing about being really, truly alone is that you don't even feel it at first."