 In 1958 considering her marriage to be over , Leigh began a relationship with the actor Jack Merivale , who knew of Leigh 's medical condition and assured Olivier he would care for her . In 1959 , when she achieved a success with the Noël Coward comedy Look After Lulu ! , The Times critic described her as " beautiful , delectably cool and matter of fact , she is mistress of every situation " . 
