I don't know how I've missed The Goodbye Girl, but I saw it recently for the first time. I LOVED IT!
I loved the characters: Elliott's persistence, Paula's real-ness, and little Lucy's quips. I loved the story and some of the lines made me laugh out loud - which rarely happens when I'm watching a movie by myself! :)
If you have missed it (like I had), watch the trailer below (although the trailer looks kinda cheesy, it's a Neil Simon play so you know it has credibility!):
I've never done this, but apparently you can rent movies from YouTube. If you have a few hours, I highly recommend renting The Goodbye Girl and watching it!