It sounds like the relationship was already damaged before the note. Otherwise she would not be afraid of you, thinking you might do something like slash her tires. And you would not be feeling hurt and judged-- thereby deciding to write the note in the first place. The note seems like it was the "breaking point" in an already dysfunctional therapeutic relationship.

At that point, over a year ago, your T was already feeling uncomfortable around you, feeling she could not trust you, and willing to give a few minutes of your session away if someone else walked by. That doesn't make for a healthy relationship.

I know you say that you think you had a good relationship with her early on, but was it really that good? Or did you idealize the relationship because it was the first time you had someone pay that kind of attention to you (perhaps your first time in long-term therapy)? Sometimes, when we get attention we aren't used to, we think the other person walks on water-- and we equate attention with love-- but that isn't necessarily the case.

Do you feel comfortable going to therapy with someone who seems to be uncomfortable/afraid around you? I would think it would be hard to feel love coming from someone who feels that way about you.