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Maybe Dumbledore already knew Voldemort wanted him dead so maybe he really did fake his death.
DD knew of the plan. He told Draco he knew about it but couldn't talk to him prior to their encounter because Voldemort would get it out of Malfoy.
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But he wanted Snape to remain on his side and thats why he pleaded with him. I really want to know whether Snape told DD about the Unbreakable Vow he made with Narcissa.
The argument they had that Hagrid overheard more or less confirms that he did. Although I think DD and Snape made an unbreakable vow when he returned to the good side so that Snape would have no chance of returning to Voldemort properly without dying.