we all saw how zoya was jealous and hurt seeing asad and billi and asad did get a hint of zoya feeling uneasy of his closeness to billi, and billi will surely take the advantage of zoya's jealosy and inform asad that zoya hurted her since she din like her closeness to asad. Asad will surely believe because he has seen zoya being jealous and i guess this is what will happen on the sangeet.
and and and when billi was hugging asad she did mention that her plan was working (to get sympathy from asad) and will remove zoya from her way!!!!