I don't know if regret is the right word. I wouldn't undo going through what I did Under the Mountain. Because a lot of people wouldn't be free if I didn't. I just... wish there had been a way around some of it. Maybe if I would have figured out the riddle sooner. Is that what you were talking about?
I was told they wouldn't. By Rhys, Tamlin and Lucian.
But he also cares about the people he cares about... very deeply. And would do anything to protect them. I don't doubt he loves even deeper.