Rich?
In the end, Nial was alone at home, and given the fact that he wanted to move to Liondra as quickly as possible, he couldn't help but believe that it was best to sell everything that held him back from moving on.
At the same time, it made him feel a little bit uncomfortable to leave behind everything that made him recall the great times he had spent in this home with his parents, Sabrina and even Melvin.
Yet, instead of letting emotions get to him, his resolve was only becoming firmer because Nial thought that he would have never been able to see his house, to begin with.
He tried to make himself less gloomy because the people who mattered to him made the memories special, not the bricks and walls.
Even if he were to continue staying inside the house, it would not necessarily make him feel any better.
Instead, the house would be the clear evidence that he was missing something; the rest of his family.