Spanish phrase
Fue culpa mía.
Meaning
It was my fault.
When to use it
It says that the speaker was responsible for a problem. It is often used to admit a mistake and apologize in a simple, honest way.
Example dialogue
No quiero jugar contigo.
I don't want to play with you.
Perdón, fue culpa mía. ¿Jugamos otra vez?
Sorry, it was my fault. Do you want to play again?