Did Yu Pingping and the dancing boy just dance?

Yes. In Don't Dance With Strangers, Yu Pingping came to the dance studio to dance with the fresh meat coach because of loneliness, and the coach was slowly attracted to Yu Pingping, and then the guy confessed his love to Yu Pingping, but Yu Pingping said that she loved her husband and her own family, and eventually chose to stay away from each other, so they just danced.