A letter released Wednesday reveals that Tupac Shakur broke up with Madonna because she was white. The letter, which was obtained by TMZ, was handwritten by Tupac in 1995 while he was in jail. Tupac writes in the letter. "But for me at least in my previous perception I felt due to my 'image' I would be letting down half of the people who made me what I thought I was." The letter will go up for auction July 19-28 at Gotta Have Rock and Roll Tupac died after being shot in 1996. He was 25.