They are very close and yet very far apart.
Their tacit understanding has evolved over time, and they have a clear understanding of each other.
They understand each other, but they can't see into each other's heart at all.
They can do a lot for each other, but they still have their own little selfishness.
They understand that some things, even if they are done, will not change.
They understand that some things, if not done, will become permanent regrets.
They walked carefully step by step towards their love...