greenielove04 did this exact scenario but she has ships you'll actually like

Todomomo

Shoto accidentally says something really hurtful. Y'all know my obsession with Murielle having to go? He probably said something about that by accident.

Murielle has never gotten a personality except like, once, because I kill her off.

Kirimina

Help-

They can't separate.

Miruhawks

Her job got in the way and she could hardly be around so they took a break.

Iidamei

No

Kamijirou

No

Dabi x toga

I mean, she's in jail after having their kid. If they wanted to breakup, there it is I guess.

Nejitama

He No matter how many times she told him he was the best boyfriend ever, he'd deny it. He thought she deserved better and he'd never be good enough for her.

Mt.Kamui

Too many people trying to start drama between them. Cheating rumors came up as well :/

Ryushot

I literally can't see them breaking up-

Idk her parents?

Reiko x Shinsou

Lack of communication and a misunderstanding.

Yeah I'm running out of ideas so you got that