Teacher Kevin Cooper, 47, had also spent three nights at a London hotel with the pupil, it was revealed.
The geography and IT sir was found guilty of sexually motivated conduct and unacceptable professional behaviour by a disciplinary panel.
They were told how he became infatuated with her whilst teaching at St James’ boarding school in Grimsby, North Lincs.
He flirted with her by text, treated her to meals out and then whisked her 200 miles away to London for three nights in a hotel.
The girl – identified only as Pupil A – told the Teacher Regulation Agency hearing in Coventry they did not have sex.
She claimed they stopped in the lay-by for "a rest".
But Cooper admitted to investigators that he had fallen for the schoolgirl.
He said: “My intention was always to remain utterly professional – once it became clear that she felt as strongly for me as I did for her, I harboured the hope that after leaving the school, we might enter a romantic relationship.”
Panel chair Alison Feist said: "Mr Cooper developed an inappropriate relationship with a pupil at the school in 2016 which involved exchanging messages by phone and on social media, and meeting outside the school in a number of different settings.
"This included staying overnight in a hotel room together and visiting restaurants."
The panel said they were "unable to reconcile Mr Cooper’s denial that he was sexually motivated with his actions".
Ms Feist added: "Mr Cooper was sexually motivated in his pursuit of an inappropriate relationship with a pupil, and as such this was serious sexual misconduct."
Dawn Dandy, on behalf of education secretary Damian Hinds, said: "Cooper was sexually motivated in his pursuit of an inappropriate relationship with a pupil, and as such this was serious sexual misconduct."
Cooper can appeal to the High Court.
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