Definitely not a true story. Eminem masterfully weaved a fictional tale in 'Stan' to make a statement about the relationship between artists and their fans.
The song 'Stan' isn't real. Eminem used his creativity to craft a powerful and fictional tale that resonated with many. It's more of a symbolic representation of fanaticism and obsession than based on actual events.
The song 'Stan' has elements drawn from real-life fan behaviors. Eminem used these to paint a vivid and somewhat disturbing picture. So, in a way, it's based on true events and emotions.