Whisk the dressing: balsamic, olive oil, yogurt, mayo, Dijon, honey, garlic, salt, and pepper Taste and adjust the honey and salt. Refrigerate while you cook.
Boil the tortellini per package directions. In the last 30 seconds, drop the broccoli florets right into the pot with the pasta; they will turn bright green.
Drain immediately and rinse under cold running water to stop the cooking, so neither the pasta nor the broccoli goes mushy. Drain well.
In a large bowl, toss the tortellini, broccoli, red onion, and bacon with the dressing until everything is coated.
Cover and chill at least 2 hours, ideally overnight, before serving.