At that moment you'll wish that she runs after you and stops you, giggling to herself as she holds your hand and grins. But life catches up to you as you take a breath and pause, collapsing on your bed as you curse your self. Maybe if you had stayed, waited for her answer, things would have changed. Maybe. But now you pass each other in the hall no longer friends and you curse yourself each moment you think of her cause you know each moment she doesn't think of you. No longer friends just this presence in your life reminding you of failure.
So you make a commitment to stay put in all your confessions, all your awkward moments. So that maybe next time your happy ending won't end without an ending.