Question Summary:
Does separation between the husband and wife invalidate the Nikah?

Question Detail:

 
My question is if husband and wife are angry at each other and talk thru email or thru skype and they stay in this state for more than 4 months will their nikah reamin valid?  If it becomes invalid what to they must do to get back together

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
The mere separation of the husband and wife for four months or more does not invalidate the Nikah. The Nikah will still remain intact.[1]
 
And Allah Ta’āla Knows Best
Arshad Ali
Student Darul Iftaa
Trinidad
Checked and Approved by,
Mufti Ebrahim Desai.
http://www.daruliftaa.net/