I agree you should ask. There's no way to know what he meant. Countertransference doesn't necessarily mean loving feelings. For example, if he has a history of having been the victim of a stalker, his countertransference reaction to your normal transference could be fear. Etc.

When I first confessed certain feelings to my therapist, he referred immediately to "transference/countertransference." He did not go into detail about what he felt towards me. Some therapists simply never refer to transference alone, but always to transference/countertransference, since it is a linked dynamic.

Personally, I was very pleased when my therapist mentioned countertransference. Not because I thought it meant he had the hots for me. But because it indicated that he would own up to his part in our dynamic and that he wasn't pretending to be some kind of "objective" observer of me, like a scientist studying a bug. I want him to be aware of his feelings and to analyze them, even if I don't need to know all that.