On September 9, the school's board arranged for the matter to be investigated by an independent party and the two were not to discuss the allegations.
However on September 10, Ms Greenwood received an email from Ms Kimber-Jones stating Mr Hapuku had contacted her five times by text. Later that night, Ms Greenwood received texts from Ms Kimber-Jones who said the principal was at her house and "banging on the front door".
Ms Greenwood and her husband went to the teacher's home and found Ms Kimber-Jones "visibly upset and frightened".
On September 12, Mr Hapuku was suspended as principal.
The tribunal said the two had since reconciled and were now living together with the child.
Allegations also emerged in September 2013 that money from a school fundraiser had not been accounted for and would be the subject of an investigation.
At the time, he also owed the school $500 for damaging a school vehicle.
However, the tribunal found the evidence "far from definitive" to conclude he had stolen any of the money received.
The tribunal said while its members found Mr Hapuku had not bullied Ms Kimber-Jones, they in no way condoned "a principal embarking on a romantic relationship with a teacher ..."
They found Mr Hapuku failed to co-operate with the investigation. He was suspended from teaching for three months and barred from applying for the roles of principal, deputy principal, head of department or any other senior managerial position for three years. He was also ordered to attend a refresher course for principalship and management in schools, and pay 50 per cent of Ms Kimber-Jones' legal costs.
The school's current principal yesterday declined to comment but confirmed Ms Kimber-Jones still worked at the school.