The Bodyguard - 1984

Barbara (Jane Birkin) marries Julien (Sami Frey), a charming and sexy guy. Paul, Barbara's old lover (Gérard Jugnot), is very suspicious of Julien. It looks like Julien's first two wives died in suspicious ways, and he got a lot of insurance money because of that. Paul can't ignore his worries, so he goes with Barbara and Julien on their honeymoon to Morocco to make sure that nothing bad happens to the woman he still loves.