This is actually so embarrassing to admit 
I'm interested in true crime and a while back I came across a now-deceased killer that I hadn't heard of before. I became obsessed with his history and became hell-bent on knowing everything there is to know, which does happen to me sometimes with certain subjects (yes, suspected ADHD traits). Except instead of the obsession fading, it got right under my skin and developed into a totally ridiculous and humiliating limerance type thing (is it limerance if they're dead??).
It's so bizarre because I am absolutely disgusted and horrified by his crimes, but then my brain is like 'oh but if he met you before his crimes, you would have saved him and life would be like this insert fantasy here'
I feel annoyed that he takes up so much of my headspace, and also feel very guilty to even be entertaining thoughts like this about such a vile person.
I am vaguely aware of hibristophillia but don't think this fully fits as I am horrified by his crimes etc.
How can I stop this please??? It's going on for about 6 months now 🙈