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My reasoning for thinking it had something to do with her is because he made a point to shoot himself right in front of her, presumably during an argument or when he was in an otherwise manic state. Additionally his entire internet presence was surrounded around her as others have pointed out, and frankly it seemed like he loved her way more than she loved him. We obviously have no hard proof either way but anecdotally it seems like it had something to do with their relationship, but not necessarily her personal fault.