If he wanted to use a purge to finally rid himself of Augustus" presence, Hermione couldn't see her husband choosing not to use the opportunity. There was a deep-seated insecurity in Antonin that he'd struggled with since his relatively unhappy childhood. Usually able to hide it well, Hermione could often see it manifest itself in his jealousy. Augustus would be a sore subject forever, especially considering the fact that she hid with him at his home in Cornwall when Antonin was desperate to find her.