I understand your anxiety. Maybe it would help to share that you feel really anxious about it being taken away. I might also suggest that it could help to think about how you are going to phrase things. While I would hope she wouldn't get defensive as the therapist, she is still human, and approaching her in an accusatory way probably won't be the best tactic. For example, I probably wouldn't accuse her of going back on her word. Nobody likes to essentially be called a liar. Instead, you could focus on describing how you felt when she didn't respond. And I would definitely share about how you have a pattern of pulling back over things like this. I would probably also acknowledge that this - the requiring of responses to every single message - is an issue and you do eventually want to be able to handle this sort of thing without it causing you distress and it disrupting relationships. I think expressing an intention and willingness to work on the problem (which isn't the requiring of the responses itself, but some sort of object constancy thing as SE mentioned) will make you much less likely to be perceived as controlling.