Why would he have ghosted me?

I met a guy when he was a delivery driver to a shop where I used to work. We used to message on WhatsApp and flirt when he delivered to work. One day he hadn’t messaged for a while so I asked if he was going to stay in touch he said that he couldn’t and that it was complicated. I accepted that I probably wouldn’t hear from him again. During Covid I went onto Snapchat and he’d sent me a message so we started up the messaging again but he’d only message me on Snapchat. We used to message and flirt and other stuff but eventually again the messsages dried up and eventually they stopped! Why did he ghost me and he obviously wasn’t honest with me!
Why would he have ghosted me?
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