I'm so sorry for your loss.
But as many said, death is part of life. It's the "conclusion" of our time here, and wherever he is, he certainly doesn't want to see you sad. So you gotta be a little strong and get better soon, tho don't hold back or hide your sorrow. It's ok to feel sad, we are only humans, we feel... really much.
If you ever need someone to speak too, count me in!