Should I tell my former Best Friend that her boyfriend propositioned me?

No i dont think you should its just going to start problems especially since it happened over 7 months ago or maybe if you want him like that you could tell her and maybe they'll break up and u can go get what you want haha i dont know thats all on you. She doesnt sound like a friend at all if she couldnt even seen how you were doing while you were sick.