First of all the lack of remorse shown by Kunal and Nandini. It's a sad fact of life but a married man or even woman can fall out of love with their spouse (often without reason- will address this in point two) and in love with someone else. It's unfair on the spouse but it happens, wether we like it or not. Showing a husband cheating on his lovely wife (as Mauli is!) is uncomfortable and sad for us viewers to watch, but it can happen. The extra martial affair to evolve from emotional to physical also can happen. However what the issue here is the total lack of remorse that is shown. Both Kunal and Nandini don't seem to have any regard for Maulis feelings here which doesn't make sense as both characters are shown to be good people at heart. Yes good people can also sometimes make the mistake of falling in love while married or in committed relationships. But good people would be guilt ridden, not behaving like love sick teenagers and taking selfies and secretly holding hands during pujas. This lack of concern for Maulis feelings really doesn't make sense to me and the fault must lie with the cvs as opposed to the characters themselves. Somewhere down the line the cvs could show Kunal and Nandini together and the viewers may even accept them if they dealt with the situation responsibly, instead of casting Mauli aside as if she is insignificant, which is currently being shown. The kind of scenes we are being shown currently are doing less to teach society and more spreading a dangerous message that it's ok to trample all over someone's marriage if you feel your love is pure and sent from God.
My second issue is what was said by Zoya in the precap to Mauli- aap khud sochiye aapke aur kunal ke rishte me kya kami reh gayi- think yourself what was lacking in your and kunals relationship. This kind of disgusting victim blaming was portrayed by zoya herself in Bepanah and now she is spreading it here also. There doesn't HAVE to be anything wrong or lacking in Maulis relationship to make her husband cheat. Yes often there are problems between couples which can cause EMAs but that isn't always the case. Before Nandini came along Kunal and Mauli were shown as the perfect couple, so why must Mauli now look for problems and flaws in herself to justify her husband's cheating? The sad fact is that some women can be the most perfect wives to their husbands and they will still cheat. So far the cvs have shown Mauli do absolutely nothing to deserve Kunal cheating on her so now to have someone tell her to look for the problems within her and her relationship is a dangerous and disgusting message to send.
My final point here is that in my eyes the majority of blame lies with Kunal. Yes Nandini is being a bad friend and very selfish but we must not forget she is also an incredibly vulnerable woman. She has been abused and exploited by her husband for years so I can see how she could fall for someone as loving and protective as Kunal. Once again it doesn't justify her lack of remorse towards Mauli but still I can have sympathy for Nandini and her situation. But there is absolutely no redemption for Kunal in my eyes. He had the perfect wife in Mauli and other than physical attraction and the need to play hero/satisfy his saviour complex I can't understand kunals behaviour at all. For me the only character worth watching the show for is Mauli but if they start showing her blaming herself as zoya wants her to do then will sadly have to switch off.