The thing about River and Jack is they're very alike. He is also someone who rarely cries, who would rather laugh off something than feel it, but he also knows that sometimes that kind of pain needs to be addressed. It's okay if she isn't usually able to do that, but it is something he can offer her with a real understanding. He holds her close to him again, kissing the top of her head.

"Maybe so, but that doesn't mean you have to like it." No one gets to choose how they die, not even Jack himself, since each time tends to be different. But it still seems unfair that their opposite timelines meant the Doctor who loved her couldn't be the one with her. Or maybe that was kinder, for him, but not for her. Her fate is sealed.

"But you're here. Right now." Jack pulls back then to look down at her, his hand caressing her cheek. "Breathing and as beautiful as ever." He is not downplaying her fate, he never would. Her grief deserves space. But they are also people who take the time they get.