I've noticed a lot of people are frustrated with this manga. I kinda get it. There are a lot of shallow side characters constantly getting thrown at you; but honestly, I kinda expected that, given the "make 100 friends" premise.
Not to mention the love triangle plot that has taken its place. Maybe Oda decided that meeting a new character every chapter or so wasn't going to cut it anymore. Personally, I'm not opposed to the change in direction, as I think it's a good thing that the existing characters get more time to develop.
That said, even I am baffled as to how Tadano, who can basically read minds at this point, is oblivious to the affection of these two girls. Hopefully he's just playing dumb to try to not hurt either of them by picking one. Hopefully. Then again, I might be missing some details that would debunk that idea. My memory's a little fuzzy.