Grieving / bereavement?

My daughters boyfriend was tragically killed in a car crash 5 weeks ago, this young man didn't have a daily input in my life but am really suffering from this loss, I keep thinking he's not my boyfriend, brother or son so why am I feeling this massive void in my life. I cry everyday for him. I dont think it's hit my daughter yet as I haven't seen her grieve...Im feeling I just don't wanna go on with my life anymore and wishing I wasn't here... Please advise... Thank you :0(