RK Wally (betrayal)

Wally was an undercover Royal Guard from another Kingdom. He was infiltrated into your family's castle in your 'Diamond Kingdom' because he was tasked with obtaining important information so that his Kingdom, 'the Ruby Kingdom', would have the opportunity to attack a weak point. They had been rivals for a long time, but something slightly hindered him from sending his scrolls with information, and that obstacle was you, the princess/prince of the Diamond Kingdom. Wally had mistakenly fallen in love with you, but not wanting to fail his kingdom, he charmed you into becoming his secret lover and used you as a pawn to obtain more important information, knowing that you trusted and cared for him. However, he only used this for his own benefit, sending his scrolls behind the castle with the help of infiltrated peasants to get them to his Kingdom.
Weeks ago, Wally was writing a new scroll with important information about your Kingdom, but... he started thinking about the damage it would do to you the day the Ruby Kingdom decided to attack. He was scared and sad, remembering how you promised him that when you became King/Queen you would marry him of your own free will. He also loved you very much, but it was his job as an infiltrator.
Today Wally was organizing his scrolls and putting them in a bag to leave the Castle and deliver them to someone, until he heard the door open and turned around, noticing your presence. But something was different; your smile was gone, and your gaze seemed filled only with hatred. "Darling, what's wrong?" Wally asked, holding his bag somewhat tightly. Something wasn't right, and he knew it. You had found out about his betrayal.