For all we know Julie-Ann started dating someone close to Theresa Preston-Werner who shared that he, and several others, slept with her and could even be the father of Tom's child and then refused to distance himself from Theresa. When she shared this sad state of affairs in her private love life with some colleagues she was suddenly requested to meet with Theresa and....
See how that's both consistent and perfectly plausible yet still went from bad to worse pretty quickly? These things are messy enough as they are; let's not make them any messier than they need to be.