We tend to think about nastalgia is a good thing, right? So it's like, the good old times. But sometimes when we look into the past, it can be like depressing in the present. And especially for people who sometimes do feel kind of sad or depressed, what they can really do is romanticize the past. The interesting thing is that if we can really start to understand the nature of why the past was better, maybe we can try to understand how the present got worse.