However, if arjun request a divorce, then I feel she should give it to him and allow him his freedom. Whatever decision he makes it will be to his and her benefit. as it is she is not certain what the relationship is between arjun and purvi and arjun is not certain what purvi is thinking and it does not seem as though she will ask for a divorce from Onir.
Moreso, if arjun wants to move on with someone new, all the better for him as there would be no baggage that he has to fetch with him and nothing to compromise his relationship with his new wife.
Look at rab se sona isqk, its ridiculous how sahiba is between ranveer and dalgeet. Now she seem to move on with ranveer.