Why did he just like my message?

Last night after midnight I posted a picture where a guy replied with 😍. I answered him 😘😘 and he answered me 🥰. I didn't send anything after that. Today he posted a story about his birthday. I sent him a happy birthday, all the best ❤️ and he just liked my message. Why did he just like my message?
Why did he just like my message?
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