For Hamlet, nothing was absolute. Nothing was worth living for. Love was but a farce. Vengeance would yield only more bloodshed. The only thing that mattered was absolute certainty. And there was certainly none of that these days.
Haunted by visions that the Ancient Walkers have granted him, Locke sets out to prepare his future son for the impending doom he must face. But a hefty price must be paid to ensure the safety of your son, your sanity, and quite possibly, the entire universe.
He has suffered a great loss. She has everything to gain from it. But she never wanted to win his affection like this.
Time heals a lot of things, and though some scars will undoubtedly remain – permanently imprinted and prone to ache when prodded – life still goes on. It's up to the the individual to choose whether or not they want to follow suit.