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lolol it happens, the only thing i can think of that sort of but not exactly fits ur descrip is this https://www.mangago.zone/read-manga/the_world_without_you/
it's popular so u mightve read this already
Can someone please recommend this trope
Seme has a ex
Seme can't forget the ex so they get someone who looks like the
ex.
Uke falls inlove with seme but seme cant forget the ex
Seme meets ex but realizes that they love the uke more.
Seme and uke gets together.
Some examples are "the man who can't taste".