What does it mean when a guy sends a heart emoji?

Anonymous
Ok so I have a crush on this guy and posted a pic I took of him and have hinted around that I have a crush on him. He obviously knows I'm sure. He actually has a girlfriend too. I was surprised today that he sent me a private heart emoji on IG. and it made me wonder why would a guy do this? and what does it mean? A heart emoji is more than just a little smiley face, I was wondering what would a guy with a girlfriend mean by sending this?
What does it mean when a guy sends a heart emoji?
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