Because Aidan knew that Aileen had turned to Giana and chose that woman to work with, of course Aidan did not remain silent. He knew what his ex-wife could do with the evidence Aileen had.
And moreover, Aidan knew what Aileen wanted from Giana. Tatum Company.
Even though this was a cunning way and Aidan felt really bad for using Zia in the middle of his problems with Giana, it was the only way he could think of right now.
By telling Zia about what Giana and Aileen were planning meant warning Hailee indirectly about this, but of course Aidan's target was not Hailee, but the man behind her.
Ramon would not stay silent when the company he was after and almost had in his hands just slipped due to an unexpected fatal mistake, which came in the form of Aileen.
