BOSTON – Andrew Curtin said it happened at least twice at his Boston-area high school in the last year. Angry about a breakup, a boy ended up at the school nurse’s office with a broken hand after punching a locker or a wall.

“You don’t think about when you see two people walking down the hall, ‘Are they in a bad relationship or is it good?’ ” the 17-year-old Waltham High School senior said Thursday.

But he was among about 250 teenagers doing a lot of thinking about healthy relationships at a seminar Thursday at Simmons College. And the dating advice was coming from an unlikely source: city government officials.