Lack of Originality
Unfortunately, a lot of guys haven't gotten the memo. You're still trying to use moves that have been used before. Sadly, these are moves the girls you're trying to get back together with already know about too.
Your ex doesn't want you to copy something that's been done before. If you're going to make a move to get her back, it had better, at the very least, be original. It needs to be something she hasn't seen before. It also needs to be something that you would do. It needs to appear sincere. Using movie lines as your guide makes her feel as though she isn't
important enough to you for something original.
Not Appropriate for Your Situation
Every relationship is different. Every breakup is somewhat unique. You can be having the same arguments as 10,000 other couples around the world, but there are things about the two of you and your situation that make those same arguments and situations unique.
No matter what the reason for the breakup was, your situation is different than Harry and Sally's (When Harry Met Sally), Joe and Kathleen's (You've Got Mail), Maverick and Charlie's (Top Gun), and Pat and Tiffany's (Silver Linings Playbook). You need to take the time and make the effort to come up with something unique and specific to your romantic situation. More importantly, it needs to be something that will matter to her and melt her heart.
Alternative Endings Worth Considering
That is, of course, if you're going for movie magic effects. However, you could do something else altogether. Something she may even find curious and shocking. You could let her go -- at least for a little while. Instead of going after the girl, give her a little time to think things through.
Absence really does make the heart grow fonder. Then, after a little time has passed, chances are you won't need to call her. She'll call you. When that happens, you can both enjoy a happy ending that's much better than anything Hollywood could come up with because it's the story that belongs to the two of you and no one else.