Adarsh, a native of Neendakara in Kollam, set himself ablaze while hugging the girl allegedly after chasing with a can of petrol, police said.
The girl is a fourth year physiotherapy student at Mahatma Gandhi University's School of Medical Education (SME). She was admitted at the Government Medical College Hospital with 60 per cent burn injuries.
Adarsh, a former student of the SME's Arpookara campus, is also admitted at the same hospital with 75 per cent burn injuries.
According to police, a 2013 batch student, came to the SME today to enquire about the date of the supplementary examination for his failed subject.
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Adarsh, who had professed his love for the girl, went to her classroom at 11 am and requested her to come out for a chat. But the girl allegedly turned down his request.
Infuriated by the rejection, Adarsh poured petrol from the can on her when she got out of the class at around 1 pm. He also chased her when she tried to flee ran away.