Gary Cumming, 31, repeatedly struck the woman on the head and body and pushed her on to a bed to her injury.
Cumming also smashed a mobile phone belonging to the woman during the incident which took place on June 14 this year.
Cumming, whose address was given as Rosneath Caravan Park, was appearing at Dumbarton Sheriff Court to be sentenced for the matter.
Deferring sentence until December 22, Sheriff Maxwell Hendry, said: “I am giving you a further three months. I expect there to be no further criminal behaviour and it that is the case then I will deal with you reasonably leniently when you come back before the court.”
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