Story help please! How to tell your girlfriend a big secret?!?

I’m stuck on this scene for a story I’m writing. Lea, who is dating Ronan, doe sn’t know Ronan is a vampire. How should I write the scene where Ronan tells her the truth? Nothing like Twilight, please. I’m getting sick of Twilight. I’m also planning on introducing a vampire hunter named Skylar, who is Lea & Ronan’s age. Ronan & Skylar are supposed to hate each other naturally, since their enemies. I want to have Skylar involved in the scene where Ronan tells Lea the truth, but he doesn’t have to be. Please help! I’ve been stuck on this scene for over a month!