Building a relationship is fun, but it’s also a lot of work. Think about it: You’re essentially on the way to getting to know someone almost as well as you know yourself. Maybe you finish each other’s sentences, maybe you know the answer to a question they’re asked even before they get a response out, or maybe you can recall their favorite meal even before your own. In addition to thinking about them constantly, you’re also looking ahead — way ahead — and fantasizing about what your collective future could look like.