Now I know why they won't go any further than confessing cuz the heroine always shut down the MC before he could even go chad-like mode. The MC isn't dense he's just hesitant because of a complex he's having.
Believing something like having 100 girlfriends is not possible in this manga is just like believing the sun is revolving around the world. Or believing black holes never existed. Or believing the world is flat. Anyways great chapt!