They were friends and admired each others work. They were also both self centred egomaniacs with highly strung "artistic" personalities. They fought. They said nasty things about each other. But yes, they were friends.You may find the below link, if not informative, amusing:https://www.harkavagrant.com/index.php?id=302
I think the fact that Liszt played at Chopin's funeral is a strong indication that they were at least somewhat close.
I am not disputing their frienship, just pointing out that we do not really know much about it.
Liszt used Chopin's apartment to conduct one of his "affairs".
You may find the below link, if not informative, amusing:https://www.harkavagrant.com/index.php?id=302
Liszt used Chopin's apartment to conduct one of his "affairs". That suggests a certain level of closeness beyond mere formal acquaintances.
It's what caused the bust-up.
What bust-up?
Words were said.
What was their relationship to each other?