Why would a guy with BPD ghost you?

He has borderline personality disorder and runs in cycles with me. He will be kind tell me he loves me and be generally attentive for a few days then he switches off. He gets distant and ghosts. My last message I said I loved him and it's been left on delivered for 10 days. He left me on delivered but still has me as a friend on FB. Any clue what could be goung on?

Why would a guy with BPD ghost you?
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