#2. Roman Reigns has insecurities that need to be addressed
Roman Reigns' insecurities are the reason why he turned his back on Paul Heyman. It's clear that Roman Reigns was never going to be able to get past the fact that Heyman was once in the corner of Brock Lesnar, despite knowing this when he first began his partnership with him.
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Reigns has a whole host of issues, one of the main ones being that he likes to blame everyone else for his problems. When Brock Lesnar turned up at SummerSlam, it was Heyman's fault, when he lost a match or is slightly distressed in any way, he has to blame The Usos or Paul Heyman.
This could be the beginning of a much bigger story but it's clear that this is an ongoing issue and Heyman may be the first part of this puzzle. This could be why The Usos finally turn on Reigns and The Bloodline implodes, but it could well be a lengthy story heading into 2022.