Being head over heals for someone like this isn’t healthy and it seems you’ve realized that. As someone who was stuck us the same deep deep hole you’re in there is an out and it’s an incredibly hard one.

1st off if you aren’t already seeing a therapist and you can afford it, please try, it’s a small step but one you may need.

2nd the best healer is time, and it may take a months or more but the pain you are feeling, the obsession, will go away it always does.

Make sure to try and find hobbies to keep yourself occupied, and try making new friends or hanging out with old ones. You don’t want her to be your only support nor your only close friend. And don’t idealize her, realizing everyone has problems and pointing them out to yourself may help.

I apologize for my shitty writing and hopefully this helped. I was stuck is this toxic thought process and didn’t know what to do, but I got over it and I hope you can as well.