I forgot about this yaoi manga's title that I've read about one "guy who liked flat-chested girls best".

So when he tried to do it with his new girlfriend and he realized she had big ones, he ended up breaking up with her.

Then "he found this cute guy" and thought it was better that it was completely flat.

I remember it was a manga that's from a while back and it has an old artstyle(or not?)... Honestly, if you know some manga like this please~ Oshiete!! 🙏🏻😢