I personally believe that the word justification is not the right word in this case, because there are two parties involved and justification means proving it right, like writers are doing by using God, they want to prove that this is how their life was supposed to be so they are not responsible for their actions God is responsible for it, I remember reading some book on space science, it had Arostole's findings about eclipse, what caught my attention was this story about Vikings and Eclipses, Vikings used to yell at the Sun during eclipse thinking if they scream loud enough the Sun will come back and coincidentally it did come back, increasing their belief in the practice, they started worshipping the Sun and The Sun is considered a God in many religions, moral of the story is that humans blame everything they don't understand on God, if you don't understand something just say God is doing it, this is what baffles me the most, makers assumed that Indian audience of 2018 won't think about the concept logically, they will serve us anything in name of God and we will accept it, to be honest, one of the reason I am against KuNan is this God and destiny thing, other is that they are trying to belittle working women (It is debatable but not under this post).
So let's move on from the show and discuss does EMA needs justification? If you are not happy in a relationship what's wrong if you end it? Or if you think you can be happier with someone else, why not give it a try? What's the point of a life of compromises? If we are living, why not live happily instead of with the guilt of not choosing the right person at the right time?
With Kunal and Mauli's relationship, I think Kunal falling out of love is not a big deal, he was too young when he got married when you grow up you understand your needs better, you are stable and you realize that you want more or different, it...although I believe that Mauli falling out of love with Kunal after he left his job is more sensible considering that she has many people who are successful doctors like her, so Kunal married Mauli with all his heart but I can tell you that I will marry Harshad Chopda right now if he asks me to but what is the guarantee that my TV crush will remain in my heart forever? Maybe Kunal is just tired of vanilla, he wants something different, is it selfish? Obviously, but is it wrong? Who am I to decide when he is going to live a life? Why should an individual live a life according to my definition of right or wrong? It's his life and he has every right to live it like he wants to but when your life or your action hurt people around you the least you can do is minimize the pain, the pain is inevitable, you can decrease it , but Like if you are not in love discuss with your partner, maybe you'll find that what you want is in her or him and she or he is not disclosing it for the same reason you are not and the reason is that you are afraid of the change, you don't want things to change, you think one question from you will change your whole life for the worse so you suffer silently. My high-school teacher used the term "Spring" to describe women empowerment and feminism, he said that the women have been pressed with such a force that like a spring they are coming back with equal force, which is creating rifts between two sexes, the example is not important, important part is the spring, the more you hide your feelings, the more powerful it will be and in the end ruin everything you could have saved by communicating.
So I don't think EMA is wrong and your reasons can be yours, none has a right to question you but you are answerable to your partner, just make sure you don't hurt people...