Therapist. Your feelings for your therapist are called transference. The therapist's response to your feelings by showing feelings or reactions is called countertransference.
Countertransference. It is normal and appropriate to have high positive regard for an effective, caring therapist. If the feelings start to become confused and cross over into "love" complete with sexual attraction, this is indeed countertransference. The best thing to do is to acknowledge it and talk about it directly. Otherwise, it will compromise the effectiveness of the therapy.