“It’s not important.” Anakin wasn’t lying. He would prefer working on his project, but it wasn’t necessary.
He knew this was his chance to escape, he could return to his work and Siri would most likely leave. They could avoid having this conversation now. But that was cowardly. He could feel through the Force the mixture of her emotions. They were going to reach the pinnacle of her need to confront him, whether it happened sooner or later wouldn't change that the outcome.