A teenager who tried to strangle his girlfriend after she received a phone call from another boy has been detained for more than four years.
A court heard how Paul Reynolds, 17, placed both his hands round the 15-year-old's neck, causing her to turn red and struggle to breathe.
Reynolds, from Galashiels, admitted assaulting the girl to the danger of her life on 29 July last year.
He also admitted throwing a knife at his partner's friend two days later.
Selkirk Sheriff Court heard that Reynolds threw the knife because he thought the girl had been talking about him.
The first charge was that he repeatedly struck the 15-year-old on the body then seized her by the neck and applied pressure to it making her unable to breathe.
Procurator fiscal Morag McLintock said Reynolds had been going out with the girl for a year but the relationship hit difficulties because of his "controlling nature" and "aggressive behaviour".
"He became angry about a phone call she had received from another boy," she said.
She said Reynolds elbowed the girl in the ribs and carried on hitting her after one of her friends asked him to stop.
"He then grabbed her by the neck and started to strangle her," Ms McLintock said. "One of her friends grabbed his arms and tried to stop him and eventually got him off her."
Ms McLintock explained how two days later the friend and the 15-year-old turned up at a house in Galashiels while Reynolds was in the garden.
He became agitated at the friend being there.
She added: "He became annoyed that the two girls were having a conversation and thought they were talking about him.
"He threw a knife in the direction of the friend but it struck a fence and struck her on the leg."
When quizzed by police Reynolds would only say "can't mind" when quizzed about attempting to strangle his partner.
Sheriff Derek O'Carroll sentenced Reynolds to 38 months in a young offenders institution.
He added on another eight months for the knife incident, two months for breaching a probation order and another one and half months for failing to appear in an identification parade.