Combine diced tomatoes, olive oil, salt, and pepper in a medium mixing bowl. and set aside.
Spread the sliced bread on both sides with mayonnaise and arrange on a rimmed baking sheet.
Grill the bread over indirect heat on the cooler side of the grill for 3 to 4 minutes on each side or until grill marks begin to deepen and the spread mayonnaise becomes transclucent. Remove and cool slightly. Rub each piece with one of the garlic cloves, cut side down.
Top each piece of bread with 1 piece of steak. Spread 1 tablespoon of triple cream cheese on top of the steak, followed by 2 heaping tablespoons of bruschetta topping. Drizzle each individual bruschetta with the balsamic glaze just before serving. Top each piece of bruschetta with chopped parsley. Serve.