Kenneth Reeves was charged with planting explosives and misleading police after he accused 18-year-old Scotty Davis of planning to blow up the Pace-Brantley Hall School in Longwood, Fla.
David was expelled from the school after he was arrested May 11 when police found two pipe bombs at his home, reported WKMG-TV, Orlando, Fla.
Investigators later determined Reeves allegedly framed Davis after Davis' mother, Heather, rejected Reeves romantically, WKMG reported.
The teenager's paternal grandfather, John Davis, described the last few weeks as "hell."
"It tears your family apart," Davis said. "I mean I brought my grandson down to questioning and it literally tore me up. I never thought I'd ever live to see anything like this."
Reeves remained in the Orange County Jail Sunday without bond.