“Remember, he had to watch his wife, cellist Jacqueline DuPre slowly die from Multiple Sclerosis. I think that can make you crazy.”
Actually, as her disease progressed, he dumped her and married another woman.
He dumped her at the very beginning of the disease -- not when she was anywhere near her deathbed. And that was only after he had cheated on Barenboim with her brother-in-law.