Sorry that you are having a hard time at the moment but please don’t feel guilty about your thoughts and feelings as none of us can help what we feel and think.
I haven’t experience of developing a crush on fictional characters in books but it is nothing to beat yourself up about. However, you say that you hate the outcome of how it makes you feel afterwards, and perhaps if it is causing you distress and you feel it is obsessive, you could speak to your GP.
We cannot give medical advice here but if you are getting referred for an autism assessment, it would be worth mentioning your difficulty to the assessor as well as your GP who might be able to refer you for psychotherapy.
Many autistic people display repetitive behaviours and these can be enjoyable and not always ‘rational’ or ‘useful’ to non autistic people. Some autistic people also have ADHD and/or OCD and/or dyspraxia.
Sorry that this mightn’t be very helpful. I hope you will soon be able to speak to a professional about the issue.
Thank you for taking the time to reply. I absolutely intend to mention this and I'm hopeful I'll be able to see a therapist to help with it
Thank you for taking the time to reply. I absolutely intend to mention this and I'm hopeful I'll be able to see a therapist to help with it