This is what I would try to do: If you really don't want to meet is there any way you can firmly but politely express this. For example, you may already have made plans for the evening and can't make that time and then suggest a time after the session?
If you can't avoid it, remember to keep calm, to listen and to act positively but still keep your boundaries intact (whatever they may be for you). Also, if things get serious give yourself time to think, because really it is only a moment in time and things will look different once your emotions have time to come off the boil. Easier said than done, I know, but it is true.
Hope whatever happens isn't too stressful.
Max
Me 36 W 37 Bomb (Easter 07) Sep (WAW July 07) "It's over" (end Oct 07) T10.5 years, M2 (before bomb)