i agree that mallika is taking this revenge thing a little too literally but i think by forcing her to apologise armaan is adding fuel to the fire instead of setting things right. whatever the circumstances, the fact remains that
1) armaan and jassi are responsible for seths losing thier inherintance and money(mallika and aryan both seem to love gulmohar to death since it is not only thier source of income but also thier dead father's dream and work).
2) armaan did decieve mallika , played around with her feelings and let both the families down
instead of apologising for his mistakes and deceptions, breaking news about his love for jassi to mallika gently and trying to fix the monetary issue by restoring seth's money to them ...what does he do??......he rejects mallika brutally (almost insultingly), goes on a drinking binge crying jassi at regular intervals, tries to oppose any legal action against jassi and makes/forces mallika to apologise to walias (by now mallika is mad as a nest of hornets and is above any sensible decisions) making her even more mad. don't you think it is time armaan acted like adults, took responsibility for his mistakes and tried his hand at diplomacy(instead of deception and lying).