He tenses a little at the hand on his shoulder but doesn't pull away; it's a kind gesture, but he doesn't feel like he deserves comfort right now, especially not from Yuffie.

"Just - if I'd been smarter about stuff, I..." He goes silent for a few moments, still too upset and miserable to fully articulate his thought processes. He finally shrugs - helpless, frustrated - and manages, "I fucked up. I fucked up, and you got hurt."