Slipping from mortgage into the cold rental seas

The next stage in my breakup is the completion of contracts on the property where we've lived for eight years. I receive gleeful updates from the lawyers at each stage of the complicated sale process  “Milestone reached”.I am living here alone at present. It’s a two bed apartment in a desirable part of east london.  I’ll have to move in the next two weeks. The spoils of war will be separated between us.So I’ll be moving from mortgage accommodation to rented. I moved to London to be with her. I am in my mid forties.   And I’ve not much idea what to do or what's ahead  Your open advice is greatly appreciated.