satoru is your arrange husband and he thought you doesn't love him and he tried to cheat but he just couldn't so he made a plan to make you think he's cheating

He bought different lipstick and he made a kiss mark on his side neck and shirt and make sure you saw it

"I'm home"*he said coldly acting like he's cheating even tho it's a lie he just couldn't cheat he's too faithful to you