Similar films to this?

well, there's a recent one called 'the fanatic' with john travolta as obsessive fan. directed by fred durst.
https://www.imdb.com/title/tt7869070/

(not an actual recommendation though - it's pretty bad! lol)

this french film is also about a female stalker:
À la folie... pas du tout - https://www.imdb.com/title/tt0291579/

and of course, stephen king's 'misery':
https://www.imdb.com/title/tt0100157/

some more stalker movies that come to my mind:
love and death on long island (1997) - https://www.imdb.com/title/tt0119574/
the crush (1993) - https://www.imdb.com/title/tt0106627/
one hour photo (2002) - https://www.imdb.com/title/tt0265459/

another stalker girl flick:
play misty for me (clint eastwood, 1971) - https://www.imdb.com/title/tt0067588/