Epic, riveting, rapturously beautiful love? The most purest expression of something you would only drown yourself into, slip into, sink as if to die from it only so that something would rip you apart at the very last minute.
No, I'm not talking about Sawyer and Juliet but what Charlie experiences without Claire, Faraday without Charlotte and last, but not least, Desmond Hume without Penny during this episode in which the flash-sideways life plays the ultimate cosmic joke as they are forced to live without them, so it was only natural these three men would be the ones most likely to question that maybe this is not how things were supposed to be.
It's almost poetic how the three of them collide in this episode trying to explore the very nature of their respective losses: Charlie in an autodestructive way, Daniel in his own particularly erratic way and Desmond in the most sublime way possible. I just can't spoil the ending, much like Charlie, Daniel and Desmond you'll have to figure it out all by yourselves.