I didn't get the impression that she was saying she doesn't care in general, just that she doesn't care about her phone number being in your phone? Maybe I'm missing a piece of the picture here (please correct me if so), but it seems a little drastic to consider ending the relationship over that. I sometimes have to remind myself that the people I seek help from are trying to get me beyond my usual unhealthy patterns of thinking/behaving, so I would not want or expect them to coddle/protect me from those same patterns. Maybe this is a good opportunity to practice taking a step back from the initial sting of what was said and approach the situation in a new/healthier way.