What happened “last time”?

When Katy, right with Laura, reveals to her seemingly doting husband Liam that Laura says she has been raped, he asks: “Do the police know what happened last time?” Katy replies: “Why should they?”

But that’s all we know. Has she alleged rape before?

Something suggests she has been in a “he said, she said” situation before, or that the authorities may have suspicions if they knew her history.