As said before, there were many reasons as to why Nicholas had returned to Beldovia.
He'd purposely left Sanguis for a breath of fresh air.
Leaving his family was a delight. Being a royal was as though you were trapped in an unbreakable cage.
For Nicholas, it wasn't being a royal that made him feel trapped. It was his family.
It was known Nicholas was the black sheep of the family, despite being its closest male heir to the throne. By order of birth, he was first in the line of succession, everyone knew that. He was Prince Nicholas of Sanguis. His family treated him that way. As if his only purpose of living was to rule Sanguis one day, and nothing else.