Maybe this points to something missing in therapy. Shouldn't therapy be focused on issues and not mainly emotional connection? Shouldn't it be helping a person become autonomous, and effective in their own life? Driving by the therapist's house without their knowing is maybe an attempt to have some kind of control? The OP also stated they think they might do it again. All of this could be discussed with the therapist in a non-judgmental way. Why should something that so obviously is bothering the client be kept secret? I also don't understand why the therapist would be discussing what the interior of her house looks like with a client. I think maybe the recent use of emails and texts may have weakened professional and client privacy. I'm not in therapy now and don't intend to start. As far as actually going out of one's way to drive by someone's house when you have no business being there. That's stalking. It just is.