Seattle School District teacher Nicole Johnson, 27, doesn’t want teens to make the mistake she made in high school — the mistake of staying silent.

Those years for Johnson were shrouded by an abusive relationship, she told a group of Kent School District students May 30, and its effects stayed with her for years after.

“I didn’t know it didn’t have to be that way,” she said, explaining that she could have avoided the long-term scars by seeking help early on. “I’m just here to encourage you to find somebody to check in with. Just step outside for a minute and run it past someone you trust.”

Johnson spoke at Kentridge High School’s Performing Arts Center as part of an assembly titled “Enough is Enough! Taking a Stand Against Teen Relationship Violence.” The event was produced by the youth group at Cornerstone United Methodist Church in Covington.

The group, made up of area high school students, organized the assembly as one if its regular community service projects, utilizing grant money from the South King County Community Network and the Jennifer Beach Foundation to educate teens about the dangers of dating violence.

“It’s a scary thing, but it’s very real,” said Cynthiann Heckelsmiller, 16, a Cornerstone youth group member and a Kentlake High School student. “A lot of people our age are going through this. Hopefully, we can reach at least some of them.”

The youth group started out by sharing the warning signs of abusive behavior with the students, bringing out giant signs showing each one at a time. The signs included behaviors ranging from seemingly harmless jealousy and criticism to physical and sexual assault.

Johnson then told her story of abuse, admitting that she ignored many of those same warning signs. She said she entered high school as a freshman who was weak and unsure of herself and soon wound up dependent on a boyfriend who slowly started showing his darker side.

“We fell madly in love, as the story goes,” she said. “But I quickly became like his little accessory, and little things started happening.”

He made her stop hanging out with her friends, and she soon had none. And when she got a higher grade than him on a test, she started purposefully lowering her grades to appease him. The relationship lasted two years, she said, finally ending after he tackled her in his front yard one day with his hands around her throat. His mother had to pry him off of her.

Johnson urged girls to seek help in the early stages of abuse. She recommended communicating suspicious behavior with trusted friends who can objectively evaluate the healthiness of the relationship.

Youth group members provided several poignant statistics about teen relationship violence, asking students in the audience to stand to help them visualize the prevalence of the problem. A third of the students stood up to represent the 33 percent of teenagers who experience at least some level of dating violence. A larger group represented the 43 percent of dating-violence victims who experience abuse at school. Seventy percent of the students stood to show the number of victims of abuse who never report it. And a third of the students stood again to show the 30 percent of teenage girls who are killed by a date or boyfriend.

The Cornerstone group passed out resource information, asking possible abuse victims to contact the resources or report their situation to a friend or adult. Each student took home a wristband showing the National Teen Dating Abuse Web site (www.loveisrespect.org) and the Teen Link hotline (866-TEENLINK).

Keith Beach Jr., president of the Jennifer Beach Foundation and a Cornerstone church member, said the statistics are shocking and the problem is serious, but the youth group’s presentation will make a positive impact.

The group “did a tremendous job” with the assembly, he said. “There’s no doubt that this will reach these students. When resources are made available to people you know need help, they will be employed.”

The Jennifer Beach Foundation is named for Beach’s late daughter, who died in a car accident in 1991 at the age of 17. She had taken an interest in helping victims of domestic abuse and violence. In 2006, the foundation was among five organizations honored by the King County Coalition Against Domestic Violence for its work to help end violence.