Oaklant
A person who thinks they're the only one who exists and gets mad if someone else likes something they like.
'You can’t like my crush too!' she yelled at me when I said I liked him too.
'I'm the only one who can talk to my mom!' he whined when I texted her.
'If you don’t buy me a burger every day, I'll cry in class!' she said, and I believed her.