It's a beautiful and poetic phrase that conveys a strong emotional connection or feeling that persists and strengthens with each passing day.
Here are some possible interpretations depending on context:
* Love and affection: "My heart every day" could express deep love for someone, indicating that their love grows stronger each day.
* Passion and longing: It could also represent a strong yearning or passion for something, like a dream or goal.
* Appreciation and gratitude: This phrase could express deep appreciation for someone or something that fills them with joy and gratitude every day.
Without more context, it's difficult to pinpoint the exact meaning. However, the phrase "mi corazón cada día" evokes a sense of strong emotion, persistence, and daily renewal.