GWB blundered when he invaded Iraq. By doing so he removed Iraq's resistance to Iran in the region.
He doubled down on the blunder when he invoked a policy of nation building in Iraq, costing many American lives.
His mishandling of, or inattention to, the American economy, resulted in two terms of Obama.
Other than these epic mistakes, he was a fine President.
He is envious of Trump, a successful President.
He's envious of Trump, but he hates Trump for blatantly calling out his bad mistakes with the Iraq war. Trump's inauguration speech stuck it to past presidents pretty good and he was right. W and his bestie Clinton were squirming.