He did, but Cinderella thought he wouldn't love her if he found out she was just a poor girl.

The step-family came home to find Cinderella cleaning, and nothing more was thought of it. However, a mere few days later, there was a great announcement throughout the entire kingdom. The Prince was going to every woman in the kingdom, and seeing if the left behind glass slipper fit them. If it did, they would be his bride, for he had fallen in love with the mysterious dancer. Knowing it would fit her, Cinderella abandoned her chores, wanting to tidy herself up for the Prince. But the Step-mother managed to connect the dots, and when Cinderella wasn't looking, she locked the poor dear up in her room.