What does it mean when a guy leaves a paragraph on seen?

There’s this guy I’ve been talking to, his behavior shifted overnight. When I asked why, he accused me of something I didn’t do. Whenever I explain my stance he ignores, last thing I sent a very heartfelt paragraph explaining things. I was left on seen.

is there a chance of him coming back after this? I don’t care about the relationship I need him to understand that he did me wrong

What does it mean when a guy leaves a paragraph on seen?
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