Prince Blueblood is the most desired bachelor in Equestria. He knows this to be true. But he doesn't want just anypony waltzing into his heart- It's gotta be somepony very special. So, every year, he "tests" those who try and win his heart. He's not a bad guy- he just projects being one to get all the "wrong" mares to fall by the wayside. Not a single one has managed to pass this far. And, at this year's Gala? Not a single one will pass this time either, if Blueblood has a say in the matter.