Who cares? What's the big deal anyway if he's her "fiance" now? So you hooked up on the set of a movie like every other actor out there, why be such a snob about it? Professional, my ass. Making movies isn't like an ordinary 9-5 anyway.
But if I had to wait til the end of a shooot to jump on Billy Zane it'd probably be a good incentive to get it all perfect in as few takes as possible!