What does it mean when a guy sends you a heart in text?

My friend has a guy that she likes and she's pretty sure he likes her back. He lives in Mexico, and she lives in the U. S. He visited over the summer and they got to spend a lot of time together. They have been texting each other and he keeps sending her hearts. She wants to know what the heart means in text, and if it's a different meaning than in the U. S? She wants to make sure before telling him she likes him.

What does it mean when a guy sends you a heart in text?
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