The song "Separate Ways" is a fantastic ballad of loss and regret and I don't know for sure but I think it is connected to Elvis's marriage breakup.
The song is one of Lisa Marie's favourites [mentioned in the Elvis by the Presleys's documentary].
Red West wrote the song and it shows a sensitive side to his nature contrasting with his tough guy bodyguard image of the Memphis Mafia.
He offered the song to Elvis knowing his divorce heartache and knew he would indentify with the words.[There's a great version on the FTD release ELVIS ON TOUR THE REHEARSALS].
Finally, "Always On My Mind" is another superb ballad and the way Elvis sings it - there must be a connection to Priscilla.
Elvis chose to record many ballads around this early 70s period and didn't want to record any rock style recordings [probably due to his divorce with Priscilla, which left him totally devastated].