Whisk together the olive oil, lime juice, garlic and 1/2 teaspoon salt in a large bowl. Add the tomatoes and avocados and gently toss in the dressing. Let the mixture sit at room temperature while you prepare the pasta.
Bring a large pot of salted water to a boil and add the pasta. Cook according to the package directions; drain and let cool.
Add the pasta and cilantro to the tomato-avocado mixture and toss together. Adjust the seasoning with salt as needed.
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