Whisk the cream cheese, sour cream, milk and confectioners' sugar until smooth in a medium bowl; set aside.
Sift the flour, cocoa powder, baking soda, baking powder and 1/2 teaspoon salt into a large bowl. Beat the eggs and granulated sugar in a large bowl until pale yellow; beat in the buttermilk, melted butter, food coloring, vanilla and vinegar. Add the egg mixture to the flour mixture and fold just until incorporated. Transfer some of the batter to a squeeze bottle with a 1/4-inch opening.
Heat a griddle or large nonstick skillet over medium-low heat. Lightly coat the hot skillet with melted butter and squeeze some of the batter onto it in the outline of a heart or hearts of the desired size. Fill in each outline with more batter; use a spatula to spread it to the edges of the heart. Cook each pancake until bubbles begin to pop on the surface, about 3 minutes. Carefully flip and cook until the bottom is set and the pancake is cooked through, 1 to 2 minutes longer. Repeat with the remaining batter.
Drizzle the cream cheese mixture and maple syrup on top of the pancakes and sprinkle with pecans.
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