An 18-year-old Chinese girl who became so obsessed with her boyfriend that she tracked his every move and called him 100 times per day was eventually diagnosed with a condition called “love brain”.

Chinese outlet Yueniu News recently reported the case of Xiaoyu, an 18-year-old girl from Sichuan province who became so obsessed with her boyfriend that she made both their lives a living nightmare. The girl’s unsettling behavior began in her first year of university when she became romantically involved with a boy whose name has not been revealed to protect his privacy. According to Du Na, a doctor at The Fourth People’s Hospital of Chengdu, Xiaoyu quickly became unnaturally obsessed with her boyfriend, wanting to know his whereabouts at all times and freaking out when he didn’t immediately reply to her texts. Sounds like your average control freak behavior, but according to the doctor, Xiaoyu suffered from a rare mental disorder called “love brain”.