Classic TV - One Step Beyond - "Delia" (1960)
A man disillusioned with life meets the woman of his dreams on a tropical island. When she suddenly disappears his life begins to spiral out of control, and in his desperation he begins to believe he is having encounters with the supernatural.
https://www.imdb.com/title/tt0507772/plotsummary?ref_=tt_ov_pl
https://www.imdb.com/title/tt0507772/plotsummary?ref_=tt_ov_pl