In the Lolita movie, when Humbert was 14 years old he had a relationship with a 14-year-old girl, but then she gets sick and dies, and this marks him for life, because we see that even at 50 he still has preferences towards teens.
How is this called?
More generally, What is the name of the condition in which a person loses another person with whom they were in love and thanks to this they try to find another person who reminds them of that lost person for the rest of their lives?
Why are there people to whom this happens?
What do they have in their brain?
Thank you in advance.