Why Ravana Kept Seeta in Ashok Vatika instead of his palace?

This is always a question in our mind that why Ravana kept Seeta Ji at Ashok Vatika after the abduction.
The fact is that - Ravana was cursed by a saint that he will not able to keep any of the women without her intention or willingness and if he does the same, his head could immediately burst.
Ravana was truly a genious in many sense. So, Ravana knew this thing that without the willingness of Seeta, he can not take her in to his Palace.
In real sense, Ravana and Kumbkarna was the guard of the heaven where Vishnu ji lives and their name was Jay and Vijay.
Due to the curse of Saptrishi , they re-incarnated themselves in earth three times and all the times they were killed by Lord Vishnu.

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