Cats usually represent intimate women. If you are a man, a cat usually represents your girlfriend or wife. If you are a woman, they usually represent your own personality.
You should be a girl.
The cat in the dream is your own doppelganger, representing the dependent and weak side of your personality or feelings.
The knife in your hand represents the ability to protect yourself.
Cutting the cat's head with a knife means that you want to completely eliminate your dependence, weak personality or feelings.
Sew again, not dead, indicating that you can't bear it, and it is difficult to completely change your dependent and weak personality or feelings.
Bleeding means you are sad and pay the price.
Throwing the cat out of the window opens your heart and keeps weakness and pain away from you.
I hope you become strong and get your feedback. I don't know if my analysis is accurate.