A jealous ex said 'look what you've made me do' to his former partner after punching her in the face.
Ryan Day, 34, invited the woman for a drink with some friends after they had split months earlier.
He confronted her after being told that she had been sleeping with another man.
After denying she had, Day 'jumped up' and punched her in the face.
"Look what you've made me do," he told her.
"If you had just been honest with me."
His victim went to hospital after suffering a suspected broken nose.
Day was hauled before a judge after admitting that he'd attacked her.
Manchester Crown Court heard that the pair had been in a relationship for six months, which ended in July last year.
The victim had been out with friends in Manchester city centre, before being invited to a house in Crumpsall in the early hours.
She went there with a pal, meeting up with Day and other mutual friends.
Day was called by a friend, who told him that his ex had been sleeping with someone else.
After he attacked her, the woman left the house in a taxi and later went to Wythenshawe hospital.
Tests revealed no fractures to the nose, but a cut had been caused to the bridge of her nose.
Day, who has 27 previous convictions, was arrested and later pleaded guilty to assault occasioning actual bodily harm.
Defending, Joe Boyd accepted it was a 'nasty injury', and said it was Day's first conviction for domestic violence.
Mr Boyd said Day, who has seven dogs, had already spent several months on remand in custody, and appealed for the judge to pass a sentence which allowed him to be released.
"He would very much like to get back to looking after his dogs," he said.
"You pleaded guilty to assaulting your former partner, causing her actual bodily harm," Judge Alan Conrad QC told Day.
"This is a serious matter, because it involves domestic violence.
"You should never lay hands on a woman.
"You didn't, mercifully, cause serious injury."
Day, of Lyndene Road, Wythenshawe, was sentenced to four months in prison, suspended for 18 months.
He was ordered to carry out the Building Better Relationships scheme, complete 30 rehabilitation activity requirement days and carry out 150 hours of unpaid work.
A five year restraining order was also passed.
