Seto was being a bit selfish/demanding on the phone. I can understand wanting to see her, especially after the way she left however many days previously. But he just went a bit nuts.
She kept saying/begging not for tonight... but he was acting childish... kind of gross. But when he found out she was seeing the director guy, that was pretty awkward. I can understand feeling bad about it, seeing someone else is more important or whatever, but the ultimatum was too far.
Since his phone went dead, he should have called her right away when he got home. That was just ridiculous, she basically thought he hung up on her... and right after saying he'll be waiting and all that.
Seto really screwed up. He should have called, and apologized, especially since he realized he had been acting stupid and childish on the phone. But if he didn't call, he damn-well should have made the date. This really looks bad...