As they crossed the borders of the Kingdom of Italy and were now in the territory of the Holy Roman Empire itself, the crew could definitely notice that the coldness of the prince towards Ren Jidian had reached new peaks. It's almost subzero now, getting towards Antartica level.
Ren Jidian could notice too, of course. He's freezing in it every second.
It seems that this was Prince Weiford's pattern now. Whenever they have a small moment of 'closeness'....
He pulls back, and he always pulls back farther than before.
It's like when you break down a wall, he builds up 20 more to strengthen his defense.
He thought after that shared dream in the Sea of Slumber, after the Prince had revealed the truth about his past that he had hidden, he will be able to bring some of that connection back in the real world, in real life.
But no! He ended up becoming colder than before, never calling him Ren again and just a flat, neutral 'Captain'.