@Xylo A long, long time ago, some people got the idea that Igarashi and Chiyo won't end up together due to his internal dialogue on the last panel of chapter 16. Me, I think that they will
eventually end up like Igarashi's mom and dad, but it will most likely be a very rough journey along a very bumpy road.
As I said before, Chiyo seems like she would rather take her Ookuma secret to the grave instead of telling her boyfriend or best friend about it.