


First of all, the story has great symbolism, nicely written. The only problem with the dialogue is that it doesn't explain enough. Here are some things that were unclear to me:1) When Jeff says he wants things to work, he's just "...just very sorry" THAT should be changed. You could replace that part with some meaningful dialogue saying WHY Jeff wants things to work. Otherwise, why does he care to come back?
2) What happened in the beginning? Why did Jeff just walk away like that? Was he mad? scared? He says "yeah, so i better go soon..." after she says "you are the best thing in my life" Is he afraid of committment? In Anna mad at him only because he couldn't say the same to her? Was this supposed to be a fight? I mean, Jeff walks off without saying anything, and then suddenly Anna's on the ground crying. I was thinking what's going on?
3) So am i right that the whole first half was a dream (with flashbacks of real happenings). She was upset first that she was "free" (didn't have Jeff). Then seeing birds again at the end makes her realize how her freedom is not an enemy but something desirable to her. Was Jeff a jerk then or what? Because she talks to herself in the car, planning what she'll say, then decides not to go see him. She's then really free when she makes her decision to turn around and go back to the beach on her own. Right?
4) Anna should say "Why can't I just be like you?" instead of "we all". This is her wish for freedom.
So, anyway, you've got an interesting idea. I think the hardest part is making the audience care about the characters, and feel what they're going through. Right now you have nice imagery and symbolism, which could be represented beautifully on film, but your dialogue needs to tell more about what happened to their relationship.
By the way, what does "O.S." mean after the person's name?
. There is no real attachment to the characters, because the dialog doesn't really give people anything to care about. Am I right in thinking OS is Off Screen?
idea: Since Anna is relating to the birds, why not have her see a male bird affectionately fluff his partner's feathers or something gentle like that. It would tell her what a relationship is supposed to be like. That might add more depth to the bird thing.
these are just ideas, and may be getting away from your original idea, but use em if you want. as long as you put some kind of negative light on the boyfriend, and show through action/words the hurt that Anna's feeling, that will help the audience to care. good luck! 
All times are ET (US)