It's a phrase that expresses disappointment and frustration, usually directed at oneself. It implies that the speaker feels their heart (representing their emotions or desires) has not delivered what they expected or wanted.
Here's a breakdown of the phrase:
* Fallaste: This means "you failed" or "you let me down." It's the past tense of the verb "fallar."
* Corazón: This means "heart."
The phrase is often used in a dramatic or poetic context, highlighting the pain and disappointment of the speaker.