Bring the water for your pasta to a boil, add the pasta and cook according to the box. While your pasta is cooking, start cooking your bacon in a large skillet over medium high heat. Cook until desired crispy-ness.
Once your bacon is cooked, place on a papertowel to dry the oil. Then drain all but 3 tbsp of the bacon oil from the pan.
Now you should be at a stopping place, your pasta should be done cooking. Drain the pasta, place in a large mixing bow, and toss with the milk. Set aside.
Add the tomatoes, thyme and garlic tot he pan with the reserved bacon grease. Stir in the pan while cooking on medium low heat until warm. Season with the some salt and pepper and remove from heat.
Your bacon should be dried by now, begin to crumble it. Be sure to leave the bacon decent sized, you dont want it to look like bacon bits, more like medium sized flakes.
Toss the crumbled bacon and the warmed tomato mixture with the pasta mixture. Once mixed fully, now add the mayo, sour cream and chives with the rest until evenly mixed. Season with salt and pepper.