Esther Dingley and Dan Colegate had been travelling throughout Europe since 2014 and she was expected to return from a solo trek on December 2.
He added: “Did Esther Dingley want to go off on her own to live her life and organise her own disappearance?
Mr Colegate said in a Facebook post on December 1 that the “prevailing opinion” of authorities was Ms Dingley was not in the mountains following extensive searches.
Mr Colegate said he was “very grateful” for the extensive efforts of rescue teams in Spain and France, which had utilised helicopters, dogs and a drone.
The couple, from Durham, started to travel after Mr Colegate had a serious health scare, and had been documenting their campervan adventures online.