Explanation The girl who was saying no no is Teddy and she is the sister of the other girl's boyfriend. She was saying no because Teddy and the other girl were partners for the band competition and it was duet, also Teddy's brother was going to participate but after Teddy's partner and her brother got into a relationship, they decided to not participate and Teddy was also digusted
Well after Spencer cheated on Tyler and Teddy, the girls started hanging out together. Then PJ met Tyler while she was at Teddy’s home and waited for her. PJ and Tyler got closer and then dated each other.