A man accused of throwing his fiancée to her death from a balcony had allegedly threatened her counsellor with physical harm.

Simon Gittany is standing trial in the New South Wales Supreme Court for the murder of Lisa Cecilia Harnum.

He is accused of throwing her to her death from the 15th floor of their Sydney CBD apartment during an argument in July 2011.

Gittany has pleaded not guilty and says Ms Harnum climbed over the railing herself.

Ms Harnum’s counsellor Michelle Richmond testified before the court today.

She says during a heated phone conversation, Gittany threatened to harm her if she contacted Ms Harnum again.

“Michelle, you f***ing bitch, if you ever come in contact with Cecilia (Lisa) again, I know where you live. I will f***ing harm you,” he allegedly said.

Ms Richmond told the court “…it was a monologue of abuse”.

“I’d never heard anyone so enraged and out of control,” she said.

Ms Richmond says she took the threat seriously because Gittany knew where she lived.

Ms Richmond says during the final weeks of Ms Harnum’s life, she spoke with her about her relationship problems with Gittany and her eating disorder, bulimia, which she was keeping secret from him.

She says Ms Harnum had told her she was not allowed to leave home alone, had no friends and was completely isolated.

Ms Harnum told her she had to be very careful with her words around Gittany, and to look him in the eyes if there were other men around when they were out.

She says Ms Harnum told her that she loved Gittany, but was also afraid of him.

Ms Harnum’s personal trainer Lisa Brown also testified.

Ms Brown says Ms Harnum was having fitness training with her at Ms Harnum’s home in the weeks before her death, to help her improve her health and possibly get pregnant.

The court heard that Ms Harnum said she had struggled with eating disorders, and prosecutors say Gittany would not let her go to the gym.

Ms Brown says Ms Harnum had sought her help to leave Gittany, but on the day before Ms Harnum died she called Ms Brown to say she was never to make contact again.

A friend from Melbourne, Gisele Pratt also gave evidence.

“She was a very bubbly, positive person,” she said.

She said Ms Harnum wanted to come and visit her in Melbourne but had never told her of any intention or thoughts of suicide, or any form of self harm.

The trial continues.