Why am I left on read?

Been talking to this guy for 5 days. We FaceTimed 2 nights ago for 3 hours it was like we known each other for years we kept laughing.

He definitely showed interest even after the call. He’s been moving over The Weekend and wouldn’t text me for a couple hours but let me know. Yesterday he was moving again he texted me a bit in the morning then he didn’t read my message until midnight and I been left on read since. He hasn’t been active on social media. What is happening is he ghosting me?
Why am I left on read?
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