Hello southafrikan100, welcome to Psych Central.

You don't say how old your boyfriend is. Looking up to a celebrity figure can be part of finding our own identity, it only becomes a problem if the obsession takes over the person's life. For example, is he watching that film so often that he does nothing else? In which case it could be turning into OCD Obssessive-Compulsive Disorder Symptoms and Treatment OCD tends to be provoked by anxiety.

Here is an article about celebrity worship The Psychology of Celebrity Worship | World of Psychology

Can you sit down with your boyfriend and see if he is unhappy with his obsession at all, if so a trip to the doctor may be in order to find out what the underlying problem is.