That's the only reason why he has issues with his mom and that's the only reason why he is mad at Zoya. Somewhere deep down he doesn't want her to become next Anjana!
Its too late for his mom, but not for Zoya, hence that dialogue !
I'm sorry if Zoya is justified for forcing Pooja's love over Adi, he is justified in forcing Yash's infidelity over Zoya!