You do not have to “live with grief every day” if you are a Christian who has lost a loved one.
You can look forward to a heavenly reunion with loved ones and continue a meaningful life until the time of that reunion.
King David was inconsolable when he lost his beloved son, Absolom. He would not bathe and would not eat. Then one day he emerged renewed and dressed and said, “My son cannot come back to me but I can go to him.”
That story in the Bible saved me from despair when I had to bury my dear, 13-year-old son, Nathan, who was my best friend. I would have instantly died to take his place but life does not necessarily give us such options.
This mortal life is unfair but the future is never hopeless for those with a faith in God.
I think that story is about the child he had with Bathsheba. He mourned the dead baby in the manner you described. 2 Samuel 12:14-22.
He mourned the rebellious Absalom also, but in a different way. 2 Samuel 18:33.