Letters central to one of the most famous love triangles in rock history are set to hit the auction block. Pattie Boyd, the famed model who romanced both George Harrison and Eric Clapton, is putting more than 100 personal items up for auction. Among them, letters Clapton wrote to woo her away from the quiet Beatle, whom Boyd was married to from 1966 to 1977. “Eric wrote the most divine, beautiful letters, and I don’t want to keep reading them,” Boyd noted to the New York Times, explaining why she decided to sell the love notes. “It hurts.” “It seems like an eternity since I last saw or spoke t…