There is something different about "us." It must be the conversations or that meeting at a common ground or maybe that little assurance of care. However, as with any relationships, the feelings triggered aren't always positive. Sometimes, negative feelings arise simply because you care, you love. However, do not let it bother you that much. Sure, when the blow comes, feel the pain. But let it go, don't dwell on it. Doing that will lead to insanity or worse, the disintegration of that relationship you hope to God lasts. Roll with the punches. You know they're worth it.