After writing Hate Me, I went back through all the books to find the lies that Keatyn told and who she told them to. I was actually really surprised by how few times she lied. You’ll also notice that Aiden’s name is listed by the large majority of them. (Because he asked so many freaking questions!)
Since you know Aiden had known who she was for quite some time, it’s easy to understand why he purposefully did ask more questions. He really wanted Keatyn to tell him the truth.
I also loved that in Get Me you found out that his wish in Adore Me was that she would trust him enough to tell him the truth.