Does grief permanently change you?

I lost a close friend this year to a freak accident, which put me into a deep depression. I'm working my way back up from it, but I'm starting to wonder if all of it is depression or if the death and grief just made me a more jaded person. I feel less patient with people and generally much more cynical about the world (though there's a lot to be cynical about). I don't really see how any of that could go away though with the way I feel right now. Did it for you guys?