Jack had spent most of his time since he became immortal building fences around his heart, in a futile attempt to protect himself from the pain of loving and losing.
It never seemed to work, and yet he couldn’t keep from trying, always hoping that this time would be different.
Over and over, he told himself that love was a luxury he couldn’t afford. It made him vulnerable, affected his judgement, and anyway, it was pointless since he’d soon be leaving with the Doctor.
But the heart wants what the heart wants; no amount of fences can pen it in.