In one of the earlier episodes, Zoya was on the road crying because of some harsh stuff Asad had told her- the beginnings of their long list of fights! And Rashid saw her and helped her out :D From then they became friends and Zoya tried to help him please his love (Dilshaad) but Zoya didn't know his long lost love was Dilshaad so she helped him. Then, when the whole doll factory shaazish thing happened, she found out that Rashid was the man who left Asad and his family so she was mad at him for some time. But they are still friends and now he's helping her! (:
Also, Ayaan knows that Asad is marrying Zoya an I'm pretty sure he knows Asad and Zoya have feelings for each other :D
Hope I helped!