If LOST was anything, it was a collective story about loners.
A loner is from parts unknown: a recluse, introvert, lone wolf, hermit, solitary, misanthrope, outsider.
John Locke was such a person. He kept other people from getting too close to himself. He feared that he would be hurt with any new, close relationship - - - still deeply broken from the abandonment by his own parents.
Boone was also a loner. We never saw him in a happy, personal relationship. He was working for the family business, or rescuing his step-sister, Shannon. He was so committed to solving family issues that he allowed his own personal life to atrophy and wither.
That is why both Locke and Boone were alone at the sideways church.
But society still frowns upon such behavior. Loners are deemed losers in many cultures. It is said that it is better to love and lost, then to never have loved at all. But at the surface, could either Locke or Boone actually be loved?
In order to be loved, a person needs to love themselves first. They need to have inner confidence to allow themselves to expose their deeply secret thoughts and emotions to another human being. For many, this is a difficult task to achieve. They think they can never meet the expectations of others. They think their flaws are magnified to monster status. They fear the unknown consequences of opening their heart, and the possibility that they will be crushed by rejection.
The only true haven for loners is the company of other loners. The series was filled with such characters, drifting through their lives with little purpose or goals. It was the plane crash that forced them to concede the fact that their lives had forever changed; that fate had brought them all together to break down their personal barriers in order to forge something foreign to most of them: solid friendships.
Friends can accomplish many amazing things. And true friendships between men and women can lead to every lasting love, as seen with the coupling of Sawyer-Juliet, Jack-Kate, Charlie-Claire and Rose-Bernard.