Describe a film that made you think

The film that has stayed with me longest is 'Past Lives', which came out a couple of years ago. It's about a Korean woman who emigrates to North America as a child, and twenty years later reconnects online with the boy she was friends with in Seoul. He eventually visits her in New York, where she now has a husband. Almost nothing dramatic happens; the film is mainly conversations between three people in cafés and bars. I watched it on a flight, which was odd because flights are usually where I watch something forgettable. I ended up thinking about it for weeks. What it made me think about was the idea that every life has parallel versions — the one you ended up living, and the ones you didn't. The film treats this not as regret but as something you simply have to make peace with. There's a scene near the end where the husband says, 'You're a place I don't know,' to his wife, and I find that line genuinely difficult to think about even now. The reason it had such an effect on me is probably that I've moved countries twice myself, and I'd been avoiding the question of what I left behind. The film didn't answer it, but it made me stop avoiding it.