“the word ‘consensual’ is right there!” no “i,” which premiered on hbo just in time for valentine’s day, squanders the opportunity to produce a documentary that could have helped people understand nonmonogamy, the forms it can take, and its inherent challenges, in favor of what ollie calls his “selfie film,” complete with a splashy final-act twist. ollie and zoe fail spectacularly to communicate not only with each other, but to the audience. turns out that while the story of ollie …