I lost two if my best friends one had cancer and died at 23 the other just died last December in a car accident. I do know your pain as he was a very close friend. It all gets easier yet we will never forget and pain will always stay. I have this great quote that is actually being tattooed in my as part if an in memory to my last loss:
We never really bury the dead we take them with us and that's the price of living.
Good luck!!