A Moment Too Long (1990)

Ted dreams of becoming rich and powerful, so he certainly doesn't want to marry his equally-poor girlfriend Nina. But when he introduces her to his elderly, rich, ailing boss Don Edmundo, his boss becomes infatuated with her. Ted persuades Nina to marry Don Edmundo, hoping for the old man's death and inheritance. Edmundo's daughter Lolit returns from the States and Nina is horrified when Ted marries her.