Nope .They would have to re- Marry. Else tomorrow small fight ignites than wife will file IPC 376 on her ex huband . wife will tear her clothes and chaddi and say he raped and molested me in front of police station .
Than husband also becomes a chakka or eunich if he starts living with wife without registering the Marriage . Looks like husband and wife did not find any suitable match for themselves and have no other option but to live togather .
By any chance are you councellor of the seperated couple .
Anyway hatsup to the reunion and may God bless the couple which reunites and may the Marriage last for better or for worse till god does them apart .