This is how Umarak feels guilty goes in
[Twilight, Spike, and Umarak return to Ponyville]
Twilight Sparkle: Umarak, you know, those things you told my friends, it taught them a valuable lesson: don't push someone away when they are there for you.
Umarak the Hunter: Why thank you.
[Umarak then feels guilty for the way he spoke to Twilight's friends]
Umarak the Hunter: But I also feel guilty for the way I spoke to them.
Umarak the Hunter: And I feel awful about what I said to Applejack, Fluttershy, Pinkie Pie, Rarity, and Rainbow Dash.