Most Helpful Guy
I saw someone mention Primer. That's a very complex movie. If you do end up watching it, don't give up on it. Upstream Color is by the same writer/director. It has a loneliness concept about it. His newest movie is called A Modern Ocean. There's not too much known about it at the moment. He wrote a script for a movie called A Topiary. I didn't read it yet, but heard some summaries of it. It seemed to have some loneliness to it. Here's a link to the script if you want to read it.
If you liked Following, I recommend Memento and The Prestige. Same writer/director and in my opinion his 2 best. I would say Memento has more of a loneliness theme.
Jake Gyllenhaal had 2 kind of lonely movies: Enemy and Nightcrawler.
Some of Paul Thomas Anderson's movies kind of have a loneliness vibe to them: Punch-Drunk Love, The Master.
I'll just start listing some: Mister Lonely, One Hour Photo, Moon, The Machinist, Into the Wild, Let the Right One In, Oldboy, The Man from Earth, Buried, The Double (2013, not 2011), Son of Rambow, Dead Man, Jeremiah Johnson, Tideland, What Happened Was.
They might not all fit the loneliness theme; it's been awhile since I've seen some of them. Synecdoche, New York is my favorite movie, so I recommend that to everyone. It has some loneliness theme to it as well.
Sorry I wrote so much. Hope it helps.
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