Have her blow you before the play, then ask the guy how you tasted afterwards !!
Ok, for the real advice. Grow the fuck up and don't even bring that shit up. Never, and i say never let her on to the fact it "bothered" you. Brush it off as if it never happened. Make sure to give her a dozen roses right after the play. Do what Arkan says and she'll be sexin' all over your shit.
Arkan's right, grow up, only pussy's get jealous over shit like that. Get her some roses...say you can't make it, then show up backstage and surprise her. Not only will she be all over you, but youll have every girl in there wish they were her...which...if you 2 break up...u have back ups
Acting like she doesn't exist is the best advice anybody can give. It's the ultimate in cool, because all women are attention whoring... whores, so they'll do anything to get some from you.... anything.