Though the original sale deed is still in your name, you have already alienated a portion of the property to him vide a registered settlement deed, his acceptance is his signature on the document.
Your logic of """"the settlee, the husband of the settler,is faithful to the settler.He is depending on settler. Considering the said fact and natural love and affection shown to the settlee and for his future prosperity,the settler has decided to execute this deed'.
1.After divorce he is not my husband...."""
is nice to hear whereas in the eyes of law, once the property as been transferred/conveyed to a third party by a registered document, the owner loses its proprietary in it.
Hence it is better to approach this matter on a carefully worded mutually agreed note alone so that he does not becomes cautious about it and refuses to part with the property or declines to cooperate to cancel the settlement deed.
The only solution to cancel the gift deed properly and as per law would be that the donee and donor jointly execute a registered cancellation deed cancelling the registered gift deed in question.