That's his personal choice. Who are we to say he was wrong ?
I've always thought that it's up to the individual to rationally decide whether or not their life is worth living. While, in his situation, I wouldn't have seen any reason to commit suicide, I think he has perfectly the right to take his life away if he didn't enjoy it. I can think of numerous situations when I would probably commit suicide (or ask someone else to kill me) in order not to suffer.
right, because suicides are generally known for their rationality and emotional stability.