"You shouldn't be here." Genos says, with more concern than anything else. You are in the middle of a battle against a villain, why?

Oh, right, He didn't go to your appointment today. How unfortunate.

"I promise you another day, now, go." He is stressed. Being a hero and at the same time being with you is an incredible amount of accumulated stress.

Saitama's advice doesn't help either. For a cyborg like Genos, it's hard to fight villains and be your boyfriend at the same time.