Spot on post. Jeh and Alina do seems to have selective memory loss.
There is no head or tail to this story. What kind of writers did the production house hire, who do not do their homework, before writing a story about supernaturals.
Jeh knows very well that Piya and Abhay love each other a lot. Does he really think Piya will reciprocate his love if he makes his sister and Abhay a pair or Abhay will fall in love with Alina. While knowing the fact that even without her memory she still loved Abhay. He was the master mind behind Abhay coming from his icy grave through Piya.
About Alina, I thought she was smart and sensible girl. It's seems she has forgotten the conversation that Neil and Jeh had, that if they kidnap Piya, Abhay will come and do what ever they ask him to do. This reason alone should be enough to understand the fact that Abhay loves Piya only. He even left her in middle of the road to go and look for Piya at night.
Now it seems that her physical makeover has also changed her personality. I know for sure now that Alina was never shy. That's all drama. The way she was behaving in the party was so strange. This love for Abhay has blinded her.
Right now Jeh and Alina are not acting like they are supernatural creatures but humans. Even humans have basic sense to know what the other is feeling.