I didn't interpret it as 'therapy failure' either....just that there are deeper places to go yet in therapy, and with that, perhaps a deeper trust is necessary to go there. Doesn't mean you haven't had success in learning to trust your T or that you haven't done good work.....just that there is more to do. I don't think your T will take it personally (I don't think a good T would do that!), think it means she has 'failed' with you or that you think she has failed.....she will most likely take it as a sign showing deeper things to work on.