In a wide skillet over medium heat, heat the oil until it shimmers, and saute the garlic and crushed red pepper until the garlic is fragrant.
Add the 2 Tbs. of pasta water and whisk in. Add the shrimp and tomatoes, and saute until the shrimp turn pink.
Remove the pan from the heat and add the arugula, salt, and cooked pasta. Toss in the pan to coat with the sauce and distribute the shrimp. Add the Romano cheese, toss quickly one more time, and serve.