This is one of the things that is irritating many of us in this track. Even I myself at one point had started thinking how is this not different from AKT trusting Malini's words. Then I realized there's a difference even when the tracks are similar. Similarity is that both Malini and Jyo managed to hit the weakpoints of men - Malini hit on AKT's weakness of male ego when Imlie ignored him and ended putting the blame on Imlie, as he couldn't accept that it was because of his faults; while Jyo too has tried to hurt Aryan in a similar manner by touching the infertility part, which is a very sensitive matter which can trigger any man's male ego. She too tried Malini's way of trying to blame Imlie but had to retract when she saw Aryan's immense trust in Imlie's loyalty. Then, her luck provided her the scapegoat in the form of Madhav, with which she could trigger Aryan's insecurities making him go blind in overprotective mode and his guilt complex triggering him into revenge mode. Not once his male ego came into picture and that's where the difference lies.
Why the otw calculative Aryan is falling for Jyo's words? With the overprotective & revenge mode on, Aryan has lost all his senses and now with Jyo around to manipulate him with facts, he is just behaving like the bridled horse. It's not because he trusts Jyo more than Imlie. It's because he trusts the medical reports which are facts and Jyo's luck has managed to get her into the good books of Aryan. Also with her broken marriage story, she has got a sympathy card too. Aryan was not the one who went and told Jyo about his infertility condition. It's Jyo who got to know about the mismatched reports from the doctor and didn't tell Aryan the truth. Instead she successfully used the opportunity in her favor and even got successful in replacing the second report. And then she played it out in front of him as if she came to know about it accidentally. Aryan cannot share the same thing with any of his dear ones, especially Arpita, as being his apne they will not be able to see him in pain. And being a human he too needs an outlet to share his pain and when Jyo on her own offered him a support, who to him is his well-wisher, he couldn't ignore it. Jyo is a well-wisher to him because she is the one who prayed for him to get a perfect life partner, which Imlie is to him. And in his eyes, she is the one who helped him with the arrangements to bring him & Imlie closer, be it the candle arrangements or the tree house date arrangement. Till now he hasn't had a single explicit proof to think against Jyo. And it is quite normal to believe Jyo's words, whom he knew from college days, than to believe Madhav's words, who all of a sudden became Imlie's friend out of nowhere. If Imlie can trust an out of the blue friend why can't Aryan trust his college friend with whom he would have spent more time than Imlie has spent with Madhav. Leave Aryan. Even Imlie till now doesn't have any doubts on Jyo. If she had, she wouldn't have listened to Jyo's advice to call Madhav home for editing & discussions. Also, don't we too share matters with our friends, which we hesitate to share with our family. We do. In short, there isn't anything abnormal in Aryan sharing everything with Jyo who to him is only his friend. The real test lies ahead. That's when Imlie brings all the proofs against Jyo. Will history be repeated? That is the plot.