Made in like 2013 ???

This movie was about a younger guy and his cat moving into an apartment a lady had died in . Over time of staying there it made him stop leaving and going into the world . He goes absolutely nuts , but the thing that was so crazy was the ending . He ended up making a trap out of one of the doors in the apartment , put nails in it , and let it fall on his body … I’ve tried explaining to google , and nothing . Was it a dream ? Or even a real movie ?