Collins showed no emotion as the verdict was announced. During the trial the jury heard evidence that he was a controlling, jealous boyfriend who assaulted Anna Larke.
The court was told he made her write down every sexual encounter she had ever had and stopped her using social networking sites such as Facebook and Twitter after reading her messages.
More top news
Irish police have seized £32 million worth of cannabis hidden in farm machinery on board a ship docking in Dublin.
Revellers reportedly jumped from the upper level of the lakeside venue to escape the flames.
A bomb blast reportedly struck a refugee camp in Syria near the border with Jordan causing injuries and deaths.