Holly’s step father, Lee Trussler, added: “I think if Holly had known what to look out for, the relationship would have ended a lot sooner than it did.”
He urged young people to “talk to each other” and support each other.
“Don’t be afraid to tell parents what’s going on, or an adult, your carers,” he said.
“Don’t be afraid to say what’s going on, because if you are afraid to say what’s going on, it could end up really bad.”
The family have also been raising money to install bleed boxes – to help deal with critical bleeds – in public areas.