If you choose to tell him, it's important you don't expect him to reciprocate. It would be completely unethical for him to do so. So please don't take his lack of reciprocation as rejection, it is simply a sign that he is an ethical therapist.
What do you want from telling him? Is this something you'd like to work through therapeutically? I think you need to take a look at what you would like to happen within the realm of what realistically could happen, and decide whether that is the way you'd like to take your therapy forward.
I don't think it's about "shutting down emotions" so much as valuing the safe and therapeutic space of therapy enough not to risk damaging it by engaging in a dual relationship. (That doesn't just go for romantic relationships - colleague relationships, friendships, business relationships and so on are also unethical dual relationships in therapy).