Hello! Ayaan doesn't love anyone currently. He used to want to get to know Zoya, so he kept chasing her. But he kept getting hurt in the process and then decided that he doesn't like her.
Asad is Ayaan's elder brother. Rashid is their father, but Ayaan's mom is Shirin and Asad's mom is Dilshaad. (Rashid had two wives)
Zoya and Ayaan only contacted each other again when they plotted against Asad to stop him from going to court and testifying against Rashid, but they still didn't know who the other was. So they only officially became friends at the holi celebrations under the watch of Asad.
Humeira is in love with Ayaan. He knows that but isn't in love with her. After failing to stop Asad from reaching the court, Razia trapped Ayaan into agreeing to marry Humeira in exchange for saving Rashid from jail. He did, and so now he's stuck as shown in the show!