I don't know about common but I think it's the way a lot of people feel. It's just... nice, you know. Knowing you're not alone even when you're physically alone.

[A soft laugh and he ruffles the back of his hair.]

That's different for everyone. It's easy for some people, like me. Basically, it's when you reach the point where you'd trust them with important stuff. When you like talking to them or would hang out with them just for fun.

Two people don't have to become friends at the same time. Like I consider you a friend but you might not feel that way.