What does "You're doing fine" mean?

Question

I watched a movie last night, A Pigeon Sat On A Branch Reflecting On Existence. In the movies, almost every character keep repeating this line: "I'm happy to hear you're doing fine." What is the meaning of that? They are talking in a phone so I don't know who they talked to, but what is "doing fine"?

Answer 1

Definition of fine:

In good health and feeling well.

Example:

“I’m fine, just fine. And you?"

So, your example is another way of saying:

I'm happy to hear you're doing well.

I'm happy to hear you're doing good.

(Oxford Dictionaries Online)