My cousin's lad is a blue but he works at Old Trafford as a steward and he said that he spoke to Koeman briefly after the match.
He said that Koeman was literally in tears, to the point where he was sobbing hysterically and uncontrollably. Koeman hugged him and said something along the lines of: "Pain is temporary. It may last a minute, or an hour, or a day, or a year, but eventually it will subside and something else will take its place."
If anyone thinks that Koeman doesn't feel our pain, you're mistaken.