What does it mean when a guy keeps texting you the ghost emoji?

We met about 7 weeks ago at work and we were also flirting at work. My last day there he said after you get back from your vacation (1 week) write me and we can grab some coffee sometime, so i gave him my number on my last day there and also texted him when i got back. We've been texting for about two days now. He always takes hours to reply and keeps sending me the ghost emoji. What is the ghost emoji meaning?
ghost emoji meaning
ghost emoji meaning
What does it mean when a guy keeps texting you the ghost emoji?
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