Sudden current loss triggering emotions from past loss

My cousin recently passed on June 27th from a dirt bike accident. He was only 29 years old, and just starting to really live life and become a great man. I wasn't extremely close with this cousin, but his sudden death has brought back so many repressed emotions that I have had from the loss of one of my best friends that happened over 8 years ago. He too, was 29 year old when he suddenly passed from acute liver failure. It is strange to me how grief sneaks' up on you when you think you have beaten it. To lose someone that should be in the prime of their life just really beginning to grow up into their potential is so hard...