A "life-long" (affair, for instance) or (just) "lifelong" <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/48.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/48.gif' alt='Emotion: movie'/> dilemma (bugging me quite some time now...)