I have a similar, but slightly different situation. I have seen my T for about the same amount of time and I just think the world of her. She was actually the one who brought up finding a new T because our work together has plateaued. I met with someone else and I am about to make the leap after a session or two more with "my" T. I bring this up because perhaps your T is thinking something similar; that you'd be better served by someone else, but doesn't know how to bring it up. She might be relieved to have you bring it up! She might be much more accepting and okay with it than you'd imagine.

Good luck. It is really hard to say goodbye after so long!

Best,
EJ