They chose to be with you first. [Reid chose to leave too. But he chose to be with her first. Maybe it's too small a distinction. She knows how sometimes the bad overwhelms the good. It's hard to think of Piotr and not think of the ending when they had a lot of time together that was good too.]

And Marina...is as real as it is to you. [That's the best she's got. Time was wrong. Reality was wrong. Sometimes the memories were falsified or emotions or physical changes were forced on them. It was a strange place but it's part of her now. That's real. Or that's how she chooses to see it.]

I really do think you'll find someone who wants to choose you. Or maybe you'll want to choose them. [If Lucy could have gone with him then he could have gone with Lucy too, right? Maybe she declined. Kitty isn't sure and doesn't want to grill him about the past.] Or maybe you'll choose each other in some Gift of the Magi kind of way.

[It's definitely not lost on her that she is putting Vash through the very thing he's describing now and if she'd been with Chekov instead it would just be him in that same position. She hopes he gets why she couldn't do that to him. She hopes the other her wasn't doing the same thing but as a rebound from her relationship with Reid. She'd hope if she did she was at least honest about it like she is with Vash now.]

Dating is a good idea. It could always be something more casual too.