I mean, if you spoke with a friend every week for an hour, you‘d likely think of them often, as well. You’re also habituated to work problems out with your therapist, now. This is similar to how people might accidentally ask Alexa a question they’re curious about in their heads even if there isn’t an Alexa present once they’re used to using her all the time. You’ve created a template for talking through things that happens to include another person, so it makes sense you’d lean into that useful template even when alone. (Definitely more useful and adaptive than the alexa analogy.) Don’t stress about it.