People still come to me as the expert in a thing I stopped caring about years ago. I nod, I give the good answer, I perform the enthusiasm I used to actually feel. Every time I do it, the pretending gets a little heavier and a little harder to keep up.
More people experience this than they realize.
You're known as the expert in something you no longer care about, and faking the interest is wearing you down.
If this sounds familiar, the Library can help you find the bigger picture.