"Thee's a good man, Roland of Gilead." *SERIOUS spoilers*

[Letti]

Rosa says it to Roland some days before the wolves come.
I read this book before as well but this was the first time I had to stop for minutes at this line.
Roland has never been told a good man before.
I would like to ask you what you think Rosalita herself meant by it. And why did she say it?
I think Rosa is a true-hearted woman and she is wise as well. She isn't a teenager girl in love... if she says something that's how she feels and she has good reasons.
Did she really think Roland was a good man? Did she say it because she was so thankful? Somehow I feel saving the children wasn't the only reason for saying it. And she knew how much Roland was obsessed with the Tower.