I think that you should prepare for the worst but expect the best. Given his inconsistent behavior, I would prepare myself for how to handle an icy exchange, but stay open to a more positive response. If he is nasty to you, just remember that this is his behavior and you haven't done anything to provoke it. It may hurt your feelings but it's his problem...his deficiency, not yours. If you feel that getting a bad response will derail you in any way, maybe just table any meeting until you are 100% sure you can handle any mood he throws your way.