A young man with Down Syndrome romantically pursues a small town single mom who is still mixed up with her volatile ex-boyfriend.
Is there such a thing as accidental film noir? It’s a deliberate genre, but Justin Lerner’s first movie, “Girlfriend,’’ seems to discover what it’s doing as it goes. It doesn’t work, and eventually the charm of his subdued ambition fades. What begins as an absorbing exercise in glum atmosphere turns mild, meek, and desperate as the stakes rise.