The jury in the trial of Stephen Farrow has been hearing from Michaela Rowsell who met him at a church in Dorset after going there to help the homeless.
She says within two weeks a friend told her that Mr Farrow fancied her. "Did you feel the same way?", asked the prosecution. "No", she replied.
She told the court the defendant invented meetings at church to see her.
She says he became "dark and violent".
Michaela Rowsell later received texts saying "I love you, I miss you".
On New Year's Eve 2011 the texts became nasty. She rang the police about one which left her petrified. It read in part:
– Text message sent by Stephen Farrow to witness
As you reject me you will suffer. I will be just around the corner and you will never know when I will be there. You don't and never knew just how disturbed I am. The church will be the first to suffer. It was always going to end like this. You can all go to hell. Watch the news because you will know it was me.
Stephen Farrow, who's 49, denies the murder of Betty Yates from Worcestershire. He also denies murdering Rev John Suddards from Gloucestershire, but admits manslaughter on the grounds of diminished responsibility.
The trial continues.
For more, visit ITV West