Well we want people to be there for us and love us so when someone comes around and you really like them, even if you haven’t known them for long you want them to be there for you, it feels good to have friends and/or people that will be there for you to talk and love you.
What is the name of the story with Marwe in it?
Twilight series I believe is what your looking for, although I asked my son what that stupid movie about the vampires was and he said Transyvania lol, but the answer you want is Twilight.