Why would anyone willingly cause their own death? Most people who take their own lives feel trapped by what they saw as a hopeless situation. No matter the reality, no matter the emotional support from others, they felt isolated and cut off from life, friendship, etc. Even if no physical illness was present, suicide victims feel intense pain, anguish, and hopelessness.He more than likely wasn’t choosing death as much as choosing to end whatever was causing him so much pain.

Was he having financial or marital problems?  Loss of a special friendship? The death of a close friend or relative? Work stress or unemployment?  A combination of these or other things could have precipitated suicide, or it could have been a response to deep depression. Although many people face similar problems and overcome them, he couldn't find a solution other than death.

Sometimes there are no apparent reasons. No matter how long and hard you search for one, you won’t be able to answer the “WHY” that haunts you. Every suicide is individual, regardless of the generalizations about the “why’s”, and there may be no way you will completely understand his thought process.

People who commit suicide don't have the mental capacity to think ahead to how it might hurt the people around them. As far as he was concerned, no one understood him, nor ever could - he more than likely felt he was doing everyone a favor. 

Understand something though, no one could have stopped him. He's happier now. He is far from the troubles that darkened him so badly here.

My heart goes out to you in this time of loss.