The teacher had his registration cancelled for five years on Friday after he was found to have "failed to maintain a professional relationship" with the student.

The man, developed an “unhealthy attachment” to a 16-year-old boy while working at a state high school in 2015 and 2016, a disciplinary hearing was told in September. The teacher, whom The Age is calling Mr S for legal reasons, chose not to attend the hearing.

"[His] behaviour constituted a substantial departure from the expectations of a member of the teaching profession and therefore amounted to serious misconduct,” Victorian Institute of Teaching chief executive Peter Corcoran said.

Panel members from the institute found that Mr S's behaviour was "characterised by a pattern of growing familiarity to the point of obsession".

Mr Corcoran said the decision to deregister was in line with the organisation's new child safety mandate.

The panel heard the teacher allegedly took the student out for lunch and told the boy he had been sexually abused as a child. He gave the student a “soulmate necklace” and called the teenager his best friend, "pal" and “muscles”.

During the hearing, panel members sifted through a large folder containing copies of hundreds of Facebook messages the teacher allegedly sent the boy between October 2015 and December 2016, sometimes up to 25 times a day.

Counsel assisting, Jeeviya Mather, said the messages were sexually suggestive, explicit and contained profanities.

They included a homemade Christmas card that replaced Santa’s sack of presents with testicles, a vacuum cleaner shaped like an erect penis and an article about chronic masturbation.

“I read this and thought of you LOL,” the teacher allegedly wrote to the boy.

On the student's 17th birthday, Mr S had showered him with gifts, including a drone, and took him out for dinner and to a bar, where they played pool.

Mr S also allegedly told the student he “was the most important person in the world to him, except for his mother”.

On one ocassion, as they were driving in the teacher's car, he allegedly said to the student: “I would never make a move on you unless you wanted me to.”

Mr S referred to his penis as "champ" and told the boy he had a tattoo of a cartoon cat next to it, the panel heard.

The hearing was told that Mr S ignored the student's requests for him to back off. In one message, the student told him he didn't trust him or feel comfortable around him.

The name of the school Mr S worked at has been suppressed to protect the affected student from undue distress.

Mr S resigned from his post and had his registration suspended after his behaviour was reported in April 2017.

After the five-year disqualification period, Mr S can reapply for registration which would be evaluated by the institute.