He was a selfish, arrogant douchebag with an impulsive personality. Suicide was probably only a matter of time for him.
Glad we're rid of him, and I would say that virtually nothing about how he ended up can be extrapolated into some universal truth. Especially about achieving "everything he wanted." 99% of people either have no goals or very modest ones and spend their lives not trying particularly hard to do very much, so it's not like contendedness breeds suicidal impulses.