Constantly online late, but ghosting me?

Long distance, have seen each other two months ago.. it was all perfectly good. Until recently he started being online around midnight for around one hour. This timing is way too late for him. And he is so stably online as if he is on a call. For last two weeks that coincided with him stopping texting me. Why would he ghost me out of nowhere and what would you do?
Constantly online late, but ghosting me?
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