All the times Dream apologized.
I kinda hated the statement from Fiddler's Green that 'Dream never apologizes' in the show, so here is a list of all the times that he did! Feel free to add more!
He apologizes to the Fates when asking more questions than is allowed.
He apologizes to Rose Walker for being obligated to kill her
He apologizes to Lyta when she has to say goodbye to her husband in the Dreaming
Not a literal apology but he remade Gault as a dream rather than letting her rot in the darkness for an eternity.
He apologizes to Nuala (well, he says 'Forgive me') for not remembering that she was at the Shakespeare play, even though, they were not introduced to each other.
He apologizes to Nada for her imprisonment in Hell (granted, he should have fixed this one a long time ago).
He apologizes to his sister for not being honest during their quest to find Destruction.
He apologizes to Hob for the people he has lost, even though this is not Dreams doing.