It's the people who sneak up on you that have the biggest clutch on your heart, I think.
In the beginning, you don't see them as a person of huge consequence. But as time goes by, you start to realize just how important to you they have grown to be.
In most cases, you realize this at literally, THE most inopportune moment.
And then you're stuck. You don't know what to say, how to act. You don't know what to do.
You want this person to instantly feel what you've been working up to over a space of time.
And there's not really anything you can do about it.