It is remarkable how little Horatio says to Hamlet. He mostly does a lot of listening. That may be one of the reasons Hamlet trusts him and finds him just.
This scene covers two pages in my text and Horatio says this line (which he doesn’t get to complete) and one more. Otherwise, it’s all Hamlet talking – mostly About Horatio.
I’ve certainly been in relationships like this – where I say almost nothing and listen for two pages – sometimes about myself. But I rarely feel truly known by the people who speechify about me.
We don’t learn much about Horatio from Horatio. Hamlet tells us he is poor and just, that he suffers, that he’s a good friend. It’s not much. Horatio functions a lot like a good projection screen.