Didn't SEVERUS SNAPE deserve a little more importance from Harry?

I mean,in the last book,Harry was there, doing heroic staffs just because of the sacrifice Severus made.But after the death of Severus, Harry didn't bother to pay homage to him,even after knowing everything from the pensive. He seemed worried about the possibility that he had to dye, not about the fact that Sev had already died!Don't you think it was extremely unfair?