Nobody grieves in the same way, bottom line do what you have to do to make yourself feel better. His choices were his own and there is nothing you could do about it.
If you had a group of friends you might wanna hang with them and talk about him. If that doesn't rub you the right way you may just wanna be alone fishing and it'll feel like your closer to him, that works for me as I'm a pretty solo type guy.
Just don't get all bent outta shape about it all at once right now. We are left with our whole lives to remember the ones we have lost, so you might as well spread it out a bit and try not to carry it all at once.
I had my best friend from grade school hang himself some odd 3 or 4 years ago, I could say I saw signs but hindsight is always 20/20. Point is there is nothing we can do about it now but remember them fondly and hope to see them later in a better place. It's not goodbye it's I'll see you later, that brings a small amount of comfort sometimes.
Also like others have said if you feel it is really fucking you up mentally don't be afraid to go see someone about it.
I lost both my brothers before they hit 30, now I'm left as the youngest child all alone. The thing for me that fights off the depression most is the thought that they wouldn't wanna see me like that. So I try to use their memories as much as possible to lift me up and give me courage when I'm feeling down in any situation. I'll use their strengths to inspire me if I hit a rough patch in life, and their downfalls to remember that we are all human and life goes on.
At the very least it helps me to literally appreciate every new day that we are given. The pain never really subsides you just learn to deal with it better. Also like said above don't be afraid to shed a tear, it'll make you feel better to get it out every once in a while.
RIP to all who have made a difference in our lives.