The 25-year-old pleaded guilty to two charges of assault in Warrnambool Magistrates Court during a two-day committal hearing that started in August and ended on Tuesday.

The man was found guilty of one charge of assault and not guilty of a second count of the same offence.

He was placed on a 12-month good behaviour bond and ordered to pay $1000 to the court fund.

The court heard the first charge related to an incident on July 23, 2019 when the couple had an argument about the man's unfaithfulness.

The pair was at the victim's home when he grabbed her by the throat, threw her to the ground and punched her to the jaw.

The victim said she was scared and wanted the man to leave.

The court heard the man messaged the victim the following day and apologised.

In his evidence, the man said he acted in self-defence and he pulled her away in an attempt to prevent himself from being assaulted.

But magistrate Peter Mellas said he was satisfied that the man wasn't telling the truth.

He said the man's evidence in court was inconsistent with his police interview.

Mr Mellas said he believed the man made "self-serving statements" to the court about his innocence and sought to describe the victim as being "the villain of the piece".

He said the victim's evidence was consistent and credible and that he didn't accept the man's claim of self-defence.

The court heard the second alleged incident involved the victim climbing through the man's window and taking his phone which was then smashed.

The victim told the court the man chased her down, grabbed her and threw her to the ground.

Mr Mellas said both parties in the second alleged incident had consumed significant amounts of alcohol, that there was inconsistent evidence about what occurred and that an independent person couldn't recall what had happened despite being within metres of the pair.

He said he was prepared to draw "at least in part an inference that (the witness) did see what happened but wasn't prepared to tell the court because she didn't want to get her friend in trouble".

The magistrate found the man not guilty of the second charge of assault.

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