I’m quite sensible in my real life relationships but I’ve both canceled therapy sessions and quit impulsively multiple times. My T has always been very welcoming and nonjudgmental about this. He has also said I could leave and come back and he’d still be there. I like the idea of emailing him and saying you are a bit confused about how you’re feeling about therapy and would like to talk about it. Not sure what kind of therapy you’re doing but in my therapy (psychodynamic) it would be ok to talk about how I think my T perceives me. It might take a while to really believe he doesn’t find you boring annoying, etc. Give it some time.