Why does the writer call the Miller Hans's "most devoted friend"?

Little Hans had a great many friends, but the most devoted friend of all was big Hugh the Miller. Indeed, so devoted was the rich Miller to little Hans, that he would never go by his garden without leaning over the wall and plucking a large nosegay, or a handful of sweet herbs, or filling his pockets with plums and cherries if it was the fruit season.

“Real friends should have everything in common,” the Miller used to say, and little Hans nodded and smiled, and felt very proud of having a friend with such noble ideas.

So little Hans worked away in his garden. During the spring, the summer, and the autumn he was very happy, but when the winter came, and he had no fruit or flowers to bring to the market, he suffered a good deal from cold and hunger, and often had to go to bed without any supper but a few dried pears or some hard nuts. In the winter, also, he was extremely lonely, as the Miller never came to see him then.

“There is no good in my going to see little Hans as long as the snow lasts,” the Miller used to say to his wife, “for when people are in trouble they should be left alone, and not be bothered by visitors. That at least is my idea about friendship, and I am sure I am right. So I shall wait till the spring comes, and then I shall pay him a visit, and he will be able to give me a large basket of primroses and that will make him so happy.”