No one is blaming Apoorva's character. In fact, he's the least to be blamed because he wasn't there when Aalekh went through the pain of realizing that he's not mentally stable and there are issues. He wasn't there when Aalekh became normal and was afraid that he might lose his mental stability again.
I think if anyone, people are mad at Ragini for celebrating the success of this plan. Fair enough, she didn't know what it was, but to celebrate afterwards was hurtful especially considering she knows what Aalekh has gone through. I felt it was insulting not only to Aalekh, but Sadhana and Ranvir.
Also, Ragini remarried and she's on the verge of moving on and her reason to stop Aalekh's remarriage as she stated was she didn't want to see anyone in her "sister's place". Well, why not? If it helps Aalekh, why not? Marrying Sadhana definitely helped Aalekh. Isn't it a bit hypocritical of her?