Shore of Love (1977)

Nawal is involved in a boating accident near an island at sea. She wakes up to find herself in the care of two brothers, Ghassan and Adel. They soon discover that she has lost her memory, and both of them fall in love with her, each trying to get closer to her. Nawal eventually falls for Ghassan. When Adel consults a doctor to understand her condition, the doctor informs him that if she regains her memory, she will no longer recognize either of them. Despite this, Adel continues to search for clues about her past and eventually discovers that she has a sister in Egypt who closely resembles her.