Source - http://www.bbc.co.uk/news/world-us-canada-40525347
More at link. Lock if old.Dated 15 January 1995, it was penned while Tupac was serving a prison sentence for sexual assault and 18 months before he was shot dead. Both artists were then at the height of their fame.
"For you to be seen with a black man wouldn't in any way jeopardize your career, if anything it would make you seem that much more open and exciting," Tupac, then 23, wrote from New York's Clinton Correctional Facility.
"But for me at least in my previous perception I felt due to my 'image' that I would be letting down half of the people who made me what I thought I was.
"Like you said, I haven't been the kind of friend I know I am capable of being," he wrote, adding: "I never meant to hurt you."