It was partially the truth even if she hated herself just a bit for admitting it. Ignoring how Antonin always made her feel when they were together in the intimate manner that married couples were expected to be, she knew that she held a great deal of power over him too. If she made him feel like she loved him, he was more likely to believe that he had nothing to fear from her. Wasn't that mutually beneficial? Maybe it was a manipulation on her part, but it worked.