He confronted staff and demanded that the young woman come out to talk with him.
She left with him, as she was "fearful he might become aggressive and cause a scene".
Arriving at their home, Greeks refused to give her the car and house keys.
He told her he was keeping the house key so he could check on her and "smash" any men he found there.
She threatened to call police and Greeks gave her the keys, after which the young woman got into her car and locked the doors, intending to drive away.
Greeks began kicking the car, denting the bodywork.
He was arrested and bailed, with a condition not to contact or associate with the young woman or go to Cobden Rd, Carterton.
Three days later Greeks phoned the woman, sent her multiple texts and phone messages, and sat in a vehicle outside her workplace. Just before 2pm, he was seen in Cobden Rd and stopped by police.
Mr Wilson said Greeks locked his car doors, wound the window partly down and asked if he was under arrest.
When told he was, Greeks sped away.
He was pursued for 12km, at one point edging away from police, who were travelling at 140km/h.
He passed other traffic and caused an oncoming driver to take evasive action to avoid a collision. He also drifted across double yellow lines.
After driving over road spikes, Greeks continued for about 2km with three flat tyres before stopping.
He told police he had "just panicked".
Judge Tony Walsh told Greeks he was lucky there had not been a crash.
Greeks had to accept his relationship with the young woman was over, Judge Walsh said.
He was sentenced to six months' supervision, 75 hours' community work and disqualified from driving for nine months.
He is to attend stop-violence courses and was ordered to pay reparation of $1615 in weekly instalments of $30 for the damage to the young woman's mother's car.
