So..... there might be difference in the original novels but to list of things that happened at the end of the manga.
-We don't actually know what the Nanako girl did to MC.
-All of the girls never actually reveal and clear up misunderstandings about MC to everyone, therefore, most people still probably think that MC really did all of that. But to be fair, FMC misunderstandings were never explained/ cleared up too either. Also both of them don't even care about the rumours anymore so it doesn't matter that much but it kinda leaves the readers feeling unsatisfactory.
But hey, at least MC and FMC had a happy ending.