Bring a large pot of salted water to a boil. Add the linguine and cook according to package instructions until al dente, about 8-10 minutes. Drain the pasta, reserving about 1/2 cup of pasta water, and set aside.
Heat olive oil in a large skillet over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant but not browned.
Add the shrimp, season with salt, pepper, and Italian seasoning, and cook for 2-3 minutes per side until they turn pink and opaque. Remove the shrimp from the skillet and set aside.
In the same skillet, lower the heat and pour in the heavy cream. Stir and scrape up any browned bits from the bottom for added flavor. Let the cream simmer gently for 3-4 minutes to thicken slightly.
Stir in the grated Parmesan cheese until melted and silky. Then, add the halved cherry tomatoes and cook for another 2 minutes until they soften just a bit.
Return the cooked shrimp to the skillet along with the crab meat, gently folding everything together. Add the drained linguine to the skillet and toss to coat evenly with the creamy sauce. If the sauce feels too thick, add a splash of the reserved pasta water to loosen it up.
Taste and adjust seasoning with additional salt and pepper if needed. Sprinkle freshly chopped parsley on top for a fresh finish. Serve immediately and enjoy!