I think this is more common than you might think. Over time I have been very explicit about my level of attachment to my T, and she has been totally comfortable with exploring my feelings. No flinching at all. There was a time when I thought I verged on obsessive, and she was really understanding. She was mostly concerned by how distressed I was about my feelings toward her. She was very clear that it's okay to feel intense things toward a person who is caring and attentive, particularly given my history.

I think she sees my attachment as a sign that therapy is working and taking me to deeper, more vulnerable places where I can heal core wounds. It's good stuff, even though it can be pretty uncomfortable for the client. And I agree that you're wise to find out sooner rather than later whether your T is trained and personally capable of doing intense attachment work. If he isn't, then it sounds like he might not be the T for you.