Mark Migallos was teaching at an unnamed school in London when he had a sexual relationship with the pupil.
Last month the Teaching Regulation Agency (TRA) decided to ban the 30-year-old from the profession indefinitely.
During the misconduct hearing he admitted meeting the girl in his vehicle where they engaged in sexual activity and touching.
He also admitted providing the pupil with cannabis and smoking it with her.
On another occasion he kissed her on school premises, Mr Migallos admitted.
The pupil told staff she and Mr Migallos had had a romantic relationship with some sexual contact and that this had started as a teacher pupil relationship, then they became friends, then more, and that she “felt he was more invested than her”.
Mr Migallos said he justified the relationship by believing he was helping her with issues she was having.
A message from Mr Migallos shown at the hearing said: “Wtf I’m a 28 year old teacher and she’s an XX-year-old student, and she had an affair with me and seemingly an affair from me.”
Other allegations admitted by Mr Migallos during the hearing is that he consumed cannabis, cocaine and ketamine in his spare time and had brought coffee laced with rum to drink during work hours.
In mitigation, Mr Migallos stated that every time he makes a mistake he tries to learn from it but he could only hope he would stop doing “such idiotic things”.
TRA decision maker David Oakley said: “The panel found serious sexual misconduct that was sexually motivated, and that Mr Migallos had used his professional position to develop that relationship.
“The panel also found that Mr Migallos had neglected to take steps to take action to safeguard Pupil A when she was at risk of harm.”
It was decided that Mr Migallos should be permanently banned from teaching in the UK.
