a man who was obsessed with a girl

Solved218 views#1 Movies#cuthimself #ink #obsessed thriller
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It was a movie I watched on TV 12 or 15 years ago. Some scenes of the movie scared me a lot. I want to find and watch the movie now, but I can’t find this movie, can you help me?
There was a man (age 20 or 25) who was obsessed with a girl. He was attacking the house where the girl lived. He was giving the family a hard time.
There are two scenes that I remember.
First (which was the scene that scared me the most), the young man was cutting his own body in the bathroom (probably a razor blade) and writing on it, then painting the cuts with ink.
The second act should have been his last scene. The father was killing the boy by pushing him through the window.
It should have been a thriller movie.

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istanbul_guy16 Selected answer as best Mar 14, 2022