What does 1 Kings 12:15 mean?

The king refused to listen to the people. This turn of events was from God, so that what he’d said through Ahijah the prophet about Jeroboam would happen. 1 Kings 12:15 - Modern Text Bible

(Rehoboam’s harshness wasn’t just his own doing—God was working through these events to fulfill his earlier promise to Jeroboam.)