They didn't put a scarlet letter on her chest, but they didn't need to. That's what the Internet is for. - Gabrielle Zevin

What does love even mean when you can find it with so many people and things?

I missed her like a reflex, even though I knew that it was just some trick of my undependable brain. Some stupid, vestigial part. The way humans have appendixes, even though they're pointless and mainly just a pain in the butt and people never even think about them unless they have to have them removed.

This is what time travel is. It's looking at a person, and seeing them in the present and the past, concurrently. And that mode of transport only worked with those one had known a significant time.