[He can't help but feel bad for this, even though he could never wish he'd forgotten about Seishirou instead-- but he never wished to forget you, either, and the guilt he feels at remembering someone else (someone you obviously know, just as he said to know you, too) over his own brother is almost overwhelming.]
I... [His voice is quiet as he admits, soft, unsure of how you'll react to this - he doesn't want to hurt you any more.] Everything, I think.