بسم الله الرحمن الرحيم
(Fatwa: 1201/1201=M/1429)
Deserting wife and living separately for one year does not cause any divorce i.e. Talaq does not take place with these actions, until the husband pronounces it.
Yes, if the husband gave her Talaq orally or in written or swore that he would not have sex with his wife for four moths, then please explain the matter and submit the question again.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband