Didn't he say he was getting married to Ishqi to make Sonu jealous? And then they threw a revenge crap. Whatever the end result is, he is not interested in marrying Ishqi, so why is he not doing anything to break the wedding?
I guess lot of things don't make sense on ITV, but at least villain ka motive toh dhyan mein rakho. And as per the sneak peek if Ishqi is going to call off wedding due to some new found secret about Mayank that she came to know now, it probably would make sense if they show Mayank intended her to know it. Otherwise creative writing is god knows where.