User blog comment:AVP3/Final Episode of Adventure Time/Adventure Time Movie/@comment-1992701-20130807061048/@comment-5927259-20130808030817

We don't even know what he did, he doesn't explain because he doesn't remember. For all we know he could have attempted to freeze Betty and that is the reason she left. Also the apocalypse happened right after so she could have been attempting to but was too pre-occupied with the matter at hand.