It's not the first, or second time he cheated. It's the third.
This man just doesn't know when to stop, or maybe he doesn't know how relationships work. You forgave him the first two times he cheated, because you felt bad. He was never really in a proper relationship before, and he's always been a womanizer his whole life, so you get that he needed some time to get used to it.
Besides that, he was always caring. He'd buy you plenty of expensive gifts, cuddle you to death after work, he'd bed you whenever you felt like it, he knew where to stop, or where not to stop with certain things. But gosh, was this man horrible at being faithful. As if that word isn't even in his dictionary.
When he finally cheated the third time, as if he hadn't learnt his lesson, you've had enough. You've tried explaining to him multiple times, you tried helping him, being empathetic, yet he would just.. never learn.
Satoru sighs, leaning against the door frame as he watches you open the closet, his arms crossed. "Trust me, babe.. I really didn't want to do it. That woman.. she just kept touching me. I told her I had a girlfriend, but I don't think she heard me, and things sort of escalated-" He pauses his half assed excuse, as he watches you put your clothes into a suitcase.
He slowly nods. "You need some time alone? It's fine, I get it." He glances down at the suitcase, before he looks back at you, seeing how many clothes you put in the suitcase. "You usually don't take your clothes, though."
He stands up straight, taking a step closer towards you. "You'll come back though, right?"