Good PMA. Don't get all caught in spinning fantasies about what will happen. Likely all 3 of you will be nervous, wary, and trying not to provoke anything. If anyone does, laugh, shrug, shake your head, or whatever seems appropriate & turn back to your S.
As hard as it is, it might be a turning point in your acceptance & detachment that helps you truly turn most of your focus on you & your well-being. Not necessarily closing off possibility of later reconciliation, but not getting stuck in the limbo of a life disrupted.
Hang in there. It will be over in a few days.
Me: 50 W:43 S6, S3 M: 12 yrs. T: 17 M is bad & Not happy Bomb Mar '14 S 5 Feb '15 D Bomb 13 Apr '15 (but "no hurry") DB Coach May '15 Wants proceed on D Aug '15 Starting 1-on-1 negotiations Sept '15