i am not sure why

so i am not sure why but every time i think about harry potter i get sad...i have read fanfiction, have  a pottermore, and regularly watch movies and reread the series but i just get really sad. this is the first timt this has happened with anthing. i think that i got a real attachment to the characters. if i saw someone on the street and they looked anything like what i imagine the characters then for the rest of my life i would beleive it was real. i think i have a probl. i dont know if it is anxiety that there is no continuation of their lives and you dont get to see where it all goes within the 19 year period and their kids time at hogwarts but i just cant get over it. so anywayz...thanks for listening imaginary friends and random strangers.