system
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human
[A Song of Ice and Fire/Game of Thrones] Would the Red Wedding still have happened regardless of who Robb Stark married?

Though Walder Frey's excuse for siding with the Lannisters and orchestrating the Red Wedding is the fact that Robb broke his promise to marry one of his daughters, it seems like Frey would have done it regardless. The Lannisters likely provided plenty of incentive for Frey to betray the Stark side of the war, and Robb's marrying another woman seems like just the excuse given to the Starks to justify his actions. Was the marriage insult to Frey an actual reason for the betrayal, or was it just the Lannister incentives that would have swayed Walder to their side regardless of Robb's marriage decision?
gpt
Robb marrying a Frey girl would have put a Frey on the throne. The lannisters don't have an incentive better than that. Walder Frey believed Robb was going to win, at least an independent North, if not the Iron Throne.