Aaliyah has joined hands with Purab to bring Abhi-Pragya closer. She does not care about Abhi or Pragya but just about herself. Purab seems to be extra-enthusiastic along with Bulbul to make Abhi admit his love for Pragya. In this mission, Purab is interacting with Aaliyah a lot.
Purab shouldn't forget two things.
-This is Aaliyah, the same Aaliyah who went to the extent of getting her brother married to a girl for revenge/hate in order to achieve Purab.
-This is also the same Aaliyah who framed Pragya in a false MMS in order to attain her revenge.
These two are the things that Purab does know about Aaliyah. Having this history, he should know she may not trustworthy. Especially since she has been in obsessive love with him, he needs to be all the more careful with her. So him hugging her, holding her hands (although platonic from his side) can escalate her emotions and obsession.
Although to Purab, Aaliyah might look like she is helping him with Abhi-Pragya relationship, it's time for him to think about his own relationship with Bulbul and how Aaliyah can trouble that. Especially given Bulbul is away from the scene due to her accident, it remains to see if Purab can stop Aaliyah from taking advantage.