Most Helpful Girl
You really misinterpreted Breakfast at Tiffany's. They're not supposed to live happily ever after, and they probably don't. Holly and Fred are both too selfish to ever be able to make each other happy long term. They're together for now, but they most definitely didn't get married and have children and move to the suburbs.
Furthermore, in the novella, Fred is gay and Holly dies.
Most Helpful Guy
Oh yes i trust me almost every time i'm sitting there yelling OH COME ON DON'T DO THAT! Thing is that's what makes a movie good. If it touches you that deep it means you can relate to any of it. Hell i was pissed a lot of times because they ended a movie on a way i didn't like it. Thing is that was done perfectly just because i got pissed.
in my opinion this makes the difference between good and less good movies :)!