I doubt he felt sick, maybe surprised, like he wasn’t sure how to respond in that moment? Is what you’re feeling for him because of transference? Not saying your feelings aren’t real, of course, but I know a lot of people end up liking their therapists in that way. Just staring and not saying anything doesn’t seem like the most helpful response to me but maybe I don’t understand enough about how therapists work through this situation. All I know is they need to keep a professional boundary but it won’t look the same in every case.