Chase Woolman began making sexual advances toward his victim when she was only 14-years-old.

Woolman sexually abused her for three years, taking advantage of the student-teacher relationship he had with her. Woolman was convicted of sexual battery and lewd molestation Friday and was sentenced to 15 years in prison, followed by 15 years of probation.

The girl had been a student at Woolman’s taekwondo school since she was 8, and the abuse began while she and other students were at a taekwondo training in 2010. Woolman started by simply touching her inappropriately, but their interaction eventually led to intercourse.

On a controlled phone call with law enforcement, Woolman admitted to having sex with his student and said he was “concerned every day the police were going to show up” and take him to jail. The victim told Woolman she felt that because he was in a leadership role in her life, she thought she could trust him.

Woolman apologized to the girl for breaking that trust.