How I Wonder What You Are (2010)

Struggling with a profound sense of isolation, 29-year-old D’s aimless life is interrupted when Kathy seeks refuge at his home following a rift with her partner. As the two spend an agonizing day waiting for a reconciliation call that never comes, they make desperate but futile attempts to bridge the emotional chasm between them. Tragically realizing they have forgotten the language of human connection, Kathy is ultimately overwhelmed by the suffocating emptiness and flees. D is left completely alone, nursing a newly shattered heart and clinging to the fragile illusion that she might one day return.