do yall obsess over past friendships??

so ive been telling my friend of 3 years literally everything about this guy i had a crush on we were in the same friend group but she didnt really support it cause she thought he was a creep

after almost half a year of having a crush on him i noticed they were getting closer. whenever i saw them together i could literally feel my blood boiling but thought "eh theyre just friends maybe she had a change of heart"

eventually found out they started dating when i still had feelings for him. cut off all ties with her obviously.

the weird thing is even though i have absolutely zero interest left in him now i've become obsessed with her. i literally check her social media daily, cry to our photos together, listen to the songs she used to like. i have the number of her followers on all social media memorized and i regularly check if she liked something. ive seen her in my dreams at least twice every week

i mean i feel like im acting like a heartbroken ex but not for the right person????

do you guys mourn past friendships this intensely or like is this not normal