John's love story is a sad one.  His second wife, Hattie Jacques, had an affair and even moved her lover into the house.  John was accepting of this, and kept their secret.  When they divorced some years later he took the blame for infidelity, having been paired up by Hattie with a friend of hers - Joan.  Joan and he later married, but after only 6 months of marriage she began a 2 year long affair with Tony Hancock.  When Tony died, Joan returned to John and stayed until his death.