The former Sunderland star, 28, knew it was an offence to kiss the 15-year-old alleged victim, a court heard today.
But he “kissed her fully on the lips” in his car and claimed he may have got turned on because of the “passionate way she was kissing me.”
Weeping in the dock in a black suit and red tie at Bradford Crown Court, Johnson said he “loved her [his girlfriend Stacey Flounders] just as much as I have always loved her.”
He continued: “I had been speaking to people who I shouldn’t have been speaking to and not being a good person.
“I wasn’t being a good person to my girlfriend and my daughter who had just been born.”
The footballer answered: “No, I never.”
Mr Pownall asked: “Were you contemplating any kind of sexual encounter with her?”
Johnson replied: “No.”
Detective Inspector Aelfwynn Sampson, of Durham Police, earlier told the court Johnson’s phone was analysed for messages sent and received from the alleged victim.
She said she had a meeting with Sunderland AFC’s chief executive Margaret Byrne to talk about the allegations made against the midfielder.
The meeting, where the issue of “safeguarding” children was discussed, took place before Johnson was interviewed by detectives.
The former Sunderland player is accused of meeting up several times with a 15-year-old girl who is said to have “idolised” the footballer.
Earlier in his trial, the jury heard testimony from the alleged victim and school friends.
The girl told the court about sex acts that allegedly took place in the Premier League star’s Range Rover when she was 15.
Johnson, of Castle Eden, Durham, has admitted grooming the girl and kissing her but denies two more serious charges of sex activity.
If found guilty, he faces up to 14 years in prison.
The trial continues.