I have to agree with Big John.
You never really get over it. There will be small things throughout life that will bring the memory of your friend flashing back with a clarity you may wish you could forget, be it a song, a scent, or a certain saying. As painful as these memories may be, hold onto to them, commit them to memory, for you will treasure them later on. If you ever have difficulty in remembering your friend, think of him in context, joyful memories will usually follow.
That is what works me. I lost 5 friends in one accident, the light plane they were passengers in collided with a mountain near Golden BC.
You will occasionally think of your friend over the years, and it may bring a tear to your eye. This will just show what an amazing impact this person had on your life.
And I am sorry that a friend was taken out of your life, no one deserves that sorrow.

Take care,
Sean (aka Arverni)