Love is weird. This is a riveting story about a mutual love/hate relationship so obsessive, so disturbing, so insane, and yet in the end so conventional, that it challenges your own concept of love — and sanity. The guy is a certified psycho stalker, but what is she? The film’s twisted tale gets creepier as it goes along, but what makes this documentary memorable — and elevates it above a generic tabloid story — is how ordinary it all ends. Can love really conquer such psychosis? You could not make this plot up.