Six days later the 33-year-old's fiancée went to kiss him one morning but found his eyes and mouth fastened shut and blisters across his body.
Mr Mannion was rushed to Warrington Hospital in Cheshire, where he was diagnosed with the rare disorder Stevens-Johnson syndrome.
Still he refused to get help not wanting to make a fuss.
Stevens-Johnson syndrome is a rare but serious disorder that affects the skin, mucous membrane, genitals and eyes.
This period of courtship is sometimes seen as a precursor to engagement.
Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries.
A man who dismissed a sore throat as a bout of the flu was struck down with a rare medical condition which left him with weeping sores and 'reptilian' scales across his body.
Cinema attendant Kevin Mannion dismissed his flu-like symptoms and refused medical treatment despite pleas from his partner.
He looked horrific, he was trembling violently and blistered beyond recognition.'His blisters began to bubble and he developed reptile-like scales on his back.In modern times, emphasis on the institution of marriage, generally described as a male-female bond, has obscured pair bonds formed by same-sex and transsexual couples, and that many heterosexual couples also bond for life without offspring, or that often pairs that do have offspring separate.Thus, the concept of marriage is changing widely in many countries.Mr Mannion spent an additional month recovering at home before he was allowed back to work. 'I assumed Kev was going to die.'I honestly thought I'd lost him, but Kev is a fighter.He still suffers with a cough, scarring on his back and a crackle in his left lung as a lasting effect of pneumonia. 'I just hope that by sharing his story, it will raise awareness of this potentially deadly condition.