16. When he sings Beatles songs to you to convey how he feels about you.

17. When you share a brain and think of all the same things, like what sounds good for food. Also, when one of you thinks of something that would seem completely random and nonsensical to anyone else, and the other person follows your train of thought with no explanation needed.

18. When you're lying in each other's arms and you realize you're the most comfortable you've ever been in your life, even if it feels exactly the same as the last time.

I'm sure there's more I like this thread, keep posting people!