You should be more specific when asking questions if you want good answers.
Because of the wind changing directions, instead of bringing the smell of humans from Volzard to tempt the monsters, it's now bringing the smell of Lastock to them. So they are being drawn to it.
Web novel chapter 98 is where the original conversation with Camilla was, and the next has Kento looking at the progress on the fortress. Go read for yourself: https://www.patreon.com/posts/70534928
And you feel like a piece of shit a lot of the time until you do finally break, with thoughts like, "I can't even cry for my loved one's death? What kind of unfeeling monster am I?", which, yeah, you really don't need in that moment, either.
The disconnect of alienation helps soften the blow, yeah. It can even make it effectively nonexistent, especially when they haven't been in your life for a long time, and it wasn't a positive note that the relationship was ended on.