Maybe you’ve been crushing on someone for a while, and they found out about your crush. Sure, it is embarrassing, when people know that you have feelings for them.
For someone to blurt out, ”You’re just obsessed with me!” the person would have to be a delusional narcissist. After someone has said something like that you would have to think twice if you really still liked them.
We have some clever comebacks that will give the self-absorbed individual a taste of their own attitude.