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Place the ground beef, sausage, and onion in a large nonstick skillet over medium-high heat. Brown and crumble the meat. Drain off grease.
Add garlic and cook for 1 minute.
Add tomato paste, diced tomatoes, pasta sauce, Italian seasoning, red pepper flakes, salt, and pepper. Simmer for a minute or two.
Transfer half the sauce to a lightly greased 6-quart slow cooker.
Add the broken spaghetti. Top with remaining sauce.
Sprinkle on the cheese. Cover and cook on LOW for 4 hours.
Stir well and serve.