Seph...? You mean Sephiroth?

*Selphie remembered the handsome young man that she'd met at the party at frowned a little*

Now listen here, Zack. Sephiroth seems like a really good guy, and he wouldn't blame you for this. He doesn't seem stupid either, and I bet he knows that this wasn't your fault...

The best you can do is apologise.. I've apologised to ... well, everyone. And if he can't accept and understand that...then more fool him.