I agree with stopdog and think you should consider your reasons for telling your T before doing anything. And I don't think you should feel guilty for not telling your T. While it's not that unusual for a client to google where their T lives and even drive by their residence, it's still one of those instances where the person may not want to know unless their safety is at risk. Since it crosses the boundaries of therapy, I think you should consider the feelings of your T, if only because they may affect your relationship. So long as you don't do it again, driving by a Ts house isn't a big deal. If you tell your T however, it could potentially become one.