I'm with atisketatasket on this one. I can't tell you how to feel about this, or what would make you feel better -- so I'm afraid you're going to have to ask yourself what you would gain/lose by keeping it to yourself, and what you would gain/lose by telling your T.

There are things like this (I've never driven by T's house, though) that I tell my T, and things like this that I don't. I couldn't really tell you what separates what I talk to him about and what I keep to myself, other than the things I talk to him about are usually things that start interfering with my ability to concentrate on the therapy. If I think I can just let it go on my own, I usually try to do that -- then I'm not focusing on something I can just let pass, that might cause some friction between us. But if I'm trying to let it go and it's just not working, I talk about it.

So if I were in your place, I'd see how I felt the next time I saw T. If the feeling like I needed to discuss it was so overwhelming that it was messing with my interaction with T, I'd slowly tiptoe toward telling her. If things pretty much went ok, I might try for a while to see if I could just let it go.

But I wouldn't do it again. You know it's going to make you feel crappy. And it's generally better to assume that your T, like many (but not all) people, would prefer that you didn't go out of your way to sneak past her house (like rainbow says, the issue is more that it's a sneaky way to get a glimpse of your T's life -- it's not like you honked your horn and waved as you drove by).

If you think talking about it will help prevent that urge to do it again, I'd say that's an argument favor of bringing it up.

I will say, though, that there's a lot of cognitive dissonance for me in insisting that you did nothing wrong, but also that you shouldn't bring it up. If you want to bring it up, bring it up. If you want to keep it to yourself, keep it to yourself. You don't have to do anything. It's your therapy, you have to decide what's therapeutic and what's not.

If you're worried your T is going to come unhinged about this, I'd say that's a red flag about your T -- in that case, maybe keep it to yourself and meanwhile think about finding a T who better suits your needs.