I'll just be bluntly honest, here.. at the end of Halo 4, I wanted Chief to at least admit he loved Cortana. Nupe :/
And honestly, for those of us that fell in love with the first Halo (refraining from cracking a joke about the nearly infinite number of H2 lovers out there), it only seems fitting that he'd be willing to break every law he's ever known for her. Sure, it 'breaks lore' and is 'inaccurate,' but some of us will cling to the idea that "love is irrational."
But, of course, at the end of Halo 4, we don't even get any form of closure with the dynamic. Instead, we're just told to shove off and wait for Halo 5. Then Locke's introduced, and yadda yadda yadda, here we are today, waiting for Halo 5 still. Sigh, I guess that's all we can do 'til it's spelled out to us through (most likely unskippable cutscenes) the game.