Sun whilst I agree that would have been fine, I have watched too many RR shows where he has been made a scapegoat of this ONS exercise.
Why isn't it mature to show that Nachiket finally found himself to be more responsible and one-woman lover after marrying Ragini. That for me is maturity where somebody's love has made you a better person. They don't need to have a nagging wife who keeps suspecting every woman he says hello to.
Even now it's not too late. Fine, Suhani wanted to go to Roopali's home and he took her. Come in the open and say it to all. She's dead for Godsake unless you have her ghost over your head. If you want a proper MU then Ragini should ask him why today on her b'day after he has planned this so-called surprise? Let the kids know that they are finding their way and it's not easy to tell everyone that they have reconciled overnight.