Sweet William(1980)

The only one he loved was Ann, apart from Edna, Pamela, Sheila, Mrs Kershaw...

William is a dashing and eccentric Scotsman whose charms rapidly overwhelm the sweet and naïve Ann, but she nearly as quickly begins to comprehend that her new beau is anything but a one-woman man. In addition to his two ex-wives, with whom he remains remarkably close, William exhibits a disturbing attraction for nearly any female who crosses his path -- Ann's friends among them.