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Dumbledore trusted Snape because Snape risked his life as a spy against Voldemore for the Order of the Phoenix.

Snape had been in love with Lily Evans, and when Voldemort decided to kill Lily and her family, Snape stopped supporting Voldemort and agreed to spy on him for Dumbledore.

Snape did all that for the love of Lily - a love he knew would never be returned. Because he had nothing to gain, and put his life on the line acting as a spy, Dumbledore trusted him.

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