There’s no right or wrong way to handle this kind of situation (other than avoiding self-destructive behavior).

Try and stay focused on the positive aspects of his life. Remember those good times,and share those stories with other people that knew him. Celebrate his life instead of simply mourning his death. But don’t fight the grief when it begins to affect you. Accept the pain as part of the healing process. It gets easier over time, but it never fully goes away.