Why do guys ghost yet keep you as a friend on FB?

I sent a message and he left it on delivered in spite of being online often throughout the day. It's been a week. We had good interactions prior to this and he just ghosted. He still has me added as a friend but what's the purpose of that? I post frequently and he doesn't have many friends on there to begin with so I'm confused.

Why do guys ghost yet keep you as a friend on FB?
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