I'm not sure who Emily DiCaprio and Greg Dunleavy are specifically. There may be a true story if they are real individuals within a particular community or event, but without more context, it's difficult to say.
Since I don't have any prior knowledge about them, it's hard to tell. They might be ordinary people with an interesting encounter or a story of friendship that developed over time.
I'm not aware of a widely known 'Greg Dunleavy' story without more context. There may be a Greg Dunleavy who has a story within a particular family, organization, or small community that is not globally famous.
I'm not sure specifically which 'Greg Dunleavy' you're referring to. There could be many people with this name. If you can provide more context like his occupation, location, or a general time period, it would be easier to tell the true story.
One such movie is 'The Wolf of Wall Street'. It tells the true story of Jordan Belfort's rise and fall in the world of finance. DiCaprio's performance was amazing as he brought Belfort's wild and unethical behavior to life.