[Mondo suspects he should be feeling more than he is; Ishimaru's in tears after all, he can hear it, even if he isn't turning around to acknowledge it - but he feels numb. Sure, he feels guilty, but even that is something that feels far away as opposed to something he's actively experiencing. He doesn't understand why this is happening, but he doesn't dwell on it either.]

I didn't do it 'cause I thought you wouldn't be able to tell. I'm not that shitty.

[He still doesn't turn to face Ishimaru, he can't.]

I'd promise you that I won't do it again, but I guess that won't mean anything. There isn't really anything I can do, is there?

[He's gone and screwed up the most important relationship he has left and he's not even feeling anything about it. That thought should make him angry at the very least. He's a bit startled to find out it doesn't.]