There’s a reason that I Love You, You’re Perfect, Now Change! has been running forever: In it, four attractive, talented and energetic young people whip through the joys and traumas of dating and coupling (and re-coupling) in scene and song. There are a couple of insightful comments and touching moments, but for the most part, the evening is pure peach soufflé. It gets audience members wincing or nodding in recognition, touching fingers under the table or just laughing themselves breathless.