Exactly. He proposed her and Faiz heard it, so what’s the point in arguing that it’s not a date? 
also look at how Mudassir was telling Faiz that you don’t deserve Hareem, the man who’s ready to marry a much younger woman just after 2 days of his wife’s death is giving lectures on what type of woman Faiz deserves 

Being with Mudassir 24/7 and not defending your honor, Hareem is the worst written female lead in a show where they are saying she’s strong. As I said, Faiz roaming around with other women would be considered similarly toxic and unacceptable, nothing absolves Hareem from the dumbness and arrogance, she’s more responsible for the separation than Faiz himself is.
If Faiz's love is so intense, like he claims, then why doesn't he talk with Hareem and clear up the misunderstandings? When the husband doesn't trust his wife and no longer wants to accept her, what should the wife do? She should see other options, and that's what Hareem is doing, and I don't see any problem with this.