Damage caused to the property in St Edmunds Walk, Hampton, by Wheeler was put at £1,700.
Peterborough Magistrates’ Court was told on Monday that he had become annoyed on July 13, 2020, when she was paying more attention to a friend at the home rather than his wish to arrange a holiday.
Wheeler, 30, left the property but then began sending abusive messages including threatening to smash up cars belonging to her and her parents.
Prosecutor Paul Brown told the hearing: “She said she would be calling the police.
“He replied with ‘you’re threatening me with the police? Watch what happens now, I’m not joking.'"
Wheeler knocked at the home trying to be let in before kicking down the full-size fire door, with the frame coming away from the wall.
Mr Brown said there was a child in the home crying and the victim made a “quite emotional” 999 call.
The case was adjourned to Huntingdon Magistrates’ Court on March 23 for preparation of a pre-sentence report.
Wheeler, of Allexton Gardens, who pleaded guilty to using violence to secure entry to premises and malicious communications, was granted unconditional bail.