#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Initialize the library with the I2C address of your LCD (0x27 or 0x3F are common)
LiquidCrystal_I2C lcd(0x27, 16, 2);

byte heart[8] = {
  0b00000,
  0b01010,
  0b11111,
  0b11111,
  0b11111,
  0b01110,
  0b00100,
  0b00000
};

void setup() {
  lcd.init();             // Initialize the LCD
  lcd.backlight();        // Turn on the backlight
  lcd.createChar(0, heart); // Create a custom character

  lcd.setCursor(0, 0);    // Set the cursor to the first row
  lcd.print(“I love you”); // Print “I love you”
}

void loop() {
  for (int pos = 0; pos < 16; pos++) {
    lcd.setCursor(pos, 1);   // Set the cursor to the second row
    lcd.write(byte(0));      // Write the heart character
    delay(200);              // Wait for 200 ms
    lcd.setCursor(pos, 1);   // Set the cursor again
    lcd.print(“ “);          // Clear the previous heart
  }
}