Place butter and garlic in a small saucepan, and heat over medium heat. Once butter is melted stir in flour, and cook for 1 minute. Gradually add wine and milk, and cook, stirring constantly, until thickened. Stir in Brie, and heat until Brie melts and sauce is thick and smooth. Stir in additional milk if desired. Sauce will thicken as it cools. Add salt and pepper to taste.