I'm gonna stick with my guns and say cons. night. Otherwise, there's no real point - they've already established that Pallavi has erased that hatred/mistrust of women, etc. that Raghav once had and they're deeply in love with each other. Exes are usually used to bring out different feelings to push the leads to get to another stage in their relationship (i.e. Mandar entry >> ILU confession).
It's sad if they have to resort to all this drama to get this done. Otherwise, these two are at that stage of their relationship already as we saw on their 'date night'.