Sorry to hear that. I have not lost a friend yet to motorcycle bad mojo yet (knock on wood). Had one co worker (newer guy) who actually raced kill him self on a brand new street bike (bullet). He had his motorcycle endorsement revoked for too much racing and stunting, and hopped on his buddies brand new bike and washed out in a curve with no jacket/pants on at 120+ mph. Helmet did not do much good in that crash.
I have had friends seriously injured by bad drivers (both had to relearn to walk, one had to have her lower leg basically re attached, other was in a wheel chair/halo for a long period, both in accidents where hit by car drivers).
I have been "brushed" by mirrors of dumb asses not paying attention, and almost hit to many times to count. I ride a tall dual sport, red, with red helmet. I weigh 350 and am 6'1" and you would think am tall enough to spot.
I try to ride as if every car on the road is actively trying to kill me. I try to ride like I am invisible to everyone except cops. I always try (mostly) to wear full helmet, and gloves, and heavy duty leather jacket (don't own any leather or reinforced pants, so I do need to get on that).
One friend I rode with, I thought for sure I would loose in a motorcycle accident, or snowmobile accident for sure, actually went in a helicopter crash (helicopter instructor pilot).
You have to enjoy your friends and family while you can. I tell my guy friends that I love them, and some may think that is gay, or lame, but some of my friends are as close as family to me, and you can't say it after they are gone.
Live life while you can.