SINGAPORE—The head of Afghanistan’s central bank has fled Kabul, questioned the loyalty of Afghan security forces, and blamed President Ashraf Ghani and his inexperienced advisors for the country’s swift and chaotic fall to the Taliban. In a Twitter thread on Monday detailing how he worked at the bank until terrorists were at the gates of the city, Acting Governor Ajmal Ahmady also said that U.S. dollar supplies were dwindling and described escaping the capital on a military flight. “On Sunday I began work. Reports throughout morning were increasingly worrisome. I left the bank and left deputies in charge. Felt terrible about leaving staff,” he said. “It did not have to end this way. I am disgusted by the lack of any planning by Afghan leadership. Saw at airport them leave without informing others.” Ghani fled Afghanistan on Sunday as Taliban terrorists entered Kabul virtually unopposed. Their arrival, barely a week …