I wouldn't see any need to tell the therapist - it sounds like you were looking for connection, like others have said. Sometimes when I feel a need to feel more connected I might reread some emails from my therapist, or read a bit of from one of the books he's written, or have a look at his public Twitter feed, which he uses professionally. This doesn't come up very often, but it has been comforting on occasion. I think it's natural for some people to feel the need for connection sometimes.

I'd be a little cautious in comparing a one-off drive-by when the therapist isn't home to stalking. I think there's the possibility of layering on a lot of stuff that isn't evidently relevant to the OP's issue.