Nope! Because Prompto had made up his mind, and he had her, and he was sticking with his convictions. It was for her own good.

"You're wrong, Nina!" he told her. "You're pretending to be happy, but you're not, I know you're not, because I know you, Nina, but it's okay, it is! Because you can still be happy, there's still a chance, especially if you're not too far gone. They can make it better, Nina, before it's too late, and then you'll be happy, like you should be. I just....I just want you to be happy, Nina! Before....before it's too late!"

Maybe it was already too late...

...but then he really needed to do this.