Dear Anne,
I think you do need to tell him, be up front with him, accurately, about the feelings he elicited in you by what he did. And I'll bet you know this yourself. You've been through therapy. I'm sure you've read some things about therapy. So you know that the key to the success of the process is complete candor. You're a sophisticated, educated, experienced person. So the therapist you chose and whom you're with now is probably the same. Which means that he won't have any negative reaction at all to your being completely honest with him.
Including telling him all about your hesitation. Since you're very intelligent and I'm sure already know everything I'm writing here, your hesitation and your fears about his potential reaction to your feelings must be significant. They're probably almost as good as bringing him a dream, which, of course, you should try very hard to do for your next session. I think you can look forward to making some interesting progress next time, with all this spread out on the table between you and he. Take care.
__________________
We must love one another or die.
W.H. Auden
We must love one another AND die.
Ygrec23