now Purvi is married to Onir. Onir was the one who supported Purvi. in this situation bringing Purvi into Arjun's life doesn't make sense. more than that for Arjun and Purvi reunion both need to divorce their respective spouses.
Arjun and Purvi will not divorce their spouse. Arjun trying to bring Ovi back with Pari. he is not thinking about anyone now. his thoughs are mostly on Pari and Ovi.
Purvi won't leave Onir because he is the one who saved her from any wrong name in this society for caring baby out of wedlock. she won't be thinking of destroying Ovi's happiness again. that is why Onir said Purvi's sacrifices are greater than her mistake.
Only one option, instead of Arjun trying to hold Pari he can hand over her to Purvi and Onir. this will make Ovi to come back to Arjun. they can start a new life. Purvi and Onir can live with Pari.
but Arjun trying to keep Pari with him looks suspicious. he seems to be more attached with Pari now. he is choosing Pari over Ovi. this will create more rift between Arjun and Ovi.
don't know what CVs planning. BT always does something unrealistic for the sake of TRP.