Going by the precap Zoya tells aditya I won't give agnipariksha because you're not ram. It is true in a way because sita took the AP for the world but for ram he never doubted her. It always clear that he believes in her purity. Although I was never happy with Ram on sending away Sita for the society and his duty. Still in case ram had gone against the society and kept sita with him and let the people think what they want. There would have been times where it would still bother him that there were people out there who thought of his wife as a low grade woman.
Aditya adapts a modern age ram, and let's the world see him as the cruel man. A man who was supported by his wife in his dark times is doubting his wife's character. Because if he accepts her after the whole scenario even when nothing happened, to the world it will look as if Zoya slept with another man to get him out of jail. Similarly how nothing happened between Ravan and sita but people believed otherwise. So he takes the bitter pill and throws her out himself so the society can question his character as a husband not zoya's as a woman.
Like Aditya has once given pain to Zoya by fixing her broken finger, he may again give her this pain to protect her infront of the society and his messed up family.