He's not upset. At least not upset in the sense that he felt Matt had been hiding anything from him. In fact - Cisco Ramon has The Flash on speed dial which would explain why he's not frightened of what he can do. It helps the tension bleed from his shoulders as he threads his fingers with Cisco's.

The Flash comes and goes quickly, taking their attacker and leaving behind only a gust of wind and a faint scent of ozone and coffee.

"I hope that means we can continue our walk? I'll understand if you'd rather head indoors," he offers, giving him an out if he needs it. But Matt hopes that out won't be necessary. "It's been a hell of a first date," a faint smile. With luck the second one won't be quite as eventful.