Once Marcus had managed to get Lilia to open up about what had happened and got down to the reason that she was feeling down, he was able to slowly help her.
She had felt disgusted with herself for having chosen to sacrifice Marcus to bring Irene back, even if it had only been a simulation.
It made her feel ugly and like a monster that was ungrateful for everything he had done, and that she was no longer worthy of his kindness.
Still, he had managed to help her get through this at least to a certain degree.
Naturally this level of trauma was going to take some time heal, especially for Lilia who is only twelve years old.
After Marcus finished reassuring Lilia one last time, he approached the rest of their group and said, "I do not know how the rest of you feel, but I think I am done here for now. This dungeon has taken a toll on all of us, and personally I think I want a break before we come back."