It's very telling that she didn't listen to your concerns or explore why you are having these feelings. There's many things she could have said rather than jumping to end the relationship outright, such as working with you to process you feelings to gain more insight into the situation before taking action and speaking her mind. If my T reacted like yours did, I probably may have felt unheard and that my feelings don't matter.

I don't see anything related to ethics here. I also don't understand the comments about your reaction being an indication of wanting your T to adore you or beg you to stay, but I agree with others who said you may be better off without her in the end. In the meantime..

I understand you are hurt, and I'm sorry her response didn't show more concern for what led to these feelings. That could have been an opportunity for new understanding, but maybe it is not too late.