1. If the MC focuses so much on the process of falling in love, you think he'd be more proactive about trying to forget his girlfriend and spending time with his love interest, right? Nope, he loves thinking about love and feeling self superior about how he's better than common lovers while doing nothing to progress his relationship for 8 months before the story begins.
2. He forces the girl he loves to deal with rejection and heartbreak over a dozen times, with no guilt, no remorse, and somehow ends up feeling proud of his own moral chutzpah at the end of seeing her almost in tears? No, I don't count thinking "is there really no better way?" while relaxing on a couch watching TV to be character development, because he never takes action on those thoughts.
3. The whole premise of the novel feels mixed up much of the time. The competition basis is that if you go out with someone, you'll instantly forget all other love interests and get attracted to them by otherworldly force. So why does the Yuri girl try to go out with him to stop him approaching her love interest? That goes against the whole point of the game from her perspective! Why does the MC participate in the game and risk losing, if all he's going to do is yap and yap about how the game's unfair and not morally by his oh-so-high standards? He might as well just man up outside the competition regulations and confess to his love interest in the next month.

until author-sensei decided kick the can down the road for what is obviously going to be volume 2, rather than wrapping up the story neatly in this volume. This story had major Bunny Girl Senpai volume 1 vibes and I was loving it, but the ending is really unsatisfying. Basically, the love interests sort of re-realize their erased love for each other, but we don't get the satisfaction of seeing that happy... so tune in next time for volume 2, where it'll probably get handled in the prologue. Sigh