Why did he insist on going on a date then ghost me?

A guy texted me repeatedly asking to go for a drink the day after. I am a quite busy person so I told him I would text him the exact time I could go in the morning. He agreed and said no problem. I actually texted him that evening, since I found out and he hasn't texted back for 4 days. Why the ghosting (he seemed very interested)? I thought it may be his ego because of my business, but I texted him very soon and never kept him hanging.
Why did he insist on going on a date then ghost me?
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