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[to Meredith] "So I go upstairs, preparing myself for what I'm going to see when I walk into my bedroom. I step on a man's jacket that doesn't belong to me. Then everything I know... it just shifts. Because what I know now is that when I go into my bedroom, I'm not just going to see that my wife is cheating on me. I'm going to see that my wife is cheating on me with Mark, who happens to be my best friend."DEREK