First I would like to start off with things slightly unrelated to the animation itself but areas of improvement that would greatly affect the quality of your work. Think about composition, camera angle and focal length of the camera, as well as the rule of thirds. Also the environment is a little ambiguous, is this a library, a study room at school, or a couple at home. Im gonna go with a study room/lobby in school. Whatever you decide, it will affect the way his eye and head moves at the start of the animation. Right now, you have the animation start off with his head and eyes supposedly in the direction of this girl. Now also ask the question what is this girl doing, is she passing across the hall? If she is, then his eyes should probably follow her. Also you might want to add a change in his head direction at the start of the animation; if you look at the guy from the perspective of his girlfriend, the way you have it right now, there is no way that she would know that he is checking this girl out. Im not saying have him do an exaggerated blatant turn checking this girl out, keep it subtle but enough so that his girlfriend realizes what he is doing. You do have his head moving up a bit, but again thinkin about it from his girlfriends perspective, she would not only have to be terribly insecure but also obsessive, and intrusive. From the animation and dialogue, I think his girlfriend sounds more insecure rather than an annoying girlfriend so I suggest having his head motion towards the girl that hes looking at a little more obvious so that his girlfriend realizes that hes checking this girl out. You also have her saying Do you like that girl? without ever looking from the corner of her eye to realize that there is a girl and he is checking her out. Also her pose and lips seem to come to a dead stop after she says do you like that girl, maybe go for a little moving hold there. I think his placement is a little too far from the girl although I like the beats of his walk when he says oh no no no, but again think of the backstory and environment, why is he standing that far away from the girl. Is he looking out a window, are they at home? Also, right before he says how could I like a girl like that, she does a weird shifting away from him; not sure whats the motivation behind that, but I think you should probably tone that down.
Really awesome animation and acting. I think you just need to put in a little more time into preproduction and thumbnailing camera angles. Also, you probably have too much stuff on your reel, just step back and look at it as if it is someone elses work and choose n keep the best stuff.