A Miami-Dade County public school teacher was arrested Tuesday on multiple charges after authorities said he had an “inappropriate relationship” with a 12-year-old girl.

According to his arrest report, Martai Delvon McCullough, 26, is a teacher at Horace Mann Middle School in El Portal.

According to the arrest report, the victim and McCullough began exchanging Post-it notes just before last Christmas, with messages like “I love you.”