Broken Mirror

Prince Yul's promiscuous ways in the palace got out of hand when he started having an affair with his own cousin. His fiancee caught them in the act which led to their separation. As royalty, his family covered his shame and brought his fiancee back. But the trust she had for him is broken, leading to insecurity in their relationship. Is there any truth in her constant accusation of him being promiscuous or is she just scared of his past behavior resurfacing?