1. Season the chicken breasts with salt and pepper. Place the chicken breasts in a large Ziploc bag. Add the barbecue sauce and mix until breasts are covered. Let the chicken marinate in the refrigerator for 30 minutes.
2. To make the Pineapple Bacon Salsa: in a medium bowl, combine pineapple, bacon, cilantro, red onion, jalapeno, garlic, and lime juice. Stir until well combined. Season with salt and pepper, to taste.
3. Preheat a grill to medium-high heat and brush the grill with olive oil. Remove the chicken breasts from the bag and place on the grill. Discard the barbecue sauce and the bag.
4. Grill chicken until cooked through, about 5 minutes per side. Remove from grill and serve warm with the Pineapple Bacon Salsa.