Miss Reed and Mr Biddlecombe met while at the University of Sussex, where Miss Reed gained her degree in business studies and Mr Biddlecombe in psychology.
The pair had flown to Asia 20 months ago as friends and their relationship had blossomed while they were away together.
They had been teaching English in Chaing Mai, Thailand before travelling to India earlier this month where they went trekking in the village of Sohra.
Ms Reed had a profile page on the website Couchsurfing, an online community used by backpackers to offer spare sofas or sleeping space to each other.
On it she wrote: "I love life. I love dancing, chatting, laughing and cheeky banter."
She wrote: "I am a teacher in Chiang Mai. I teach conversation and corporate English to local people and businesses. I love it!"
Mr Biddlecombe's father, Graham, 56, said that had been hoping that "by some miracle, she would be alive".
He said: "A miracle did not happen and now it's just awful, a complete mess, like the stuff you see on films.
"Anthony wondered whether they would find Chrissie wandering around in a daze, having forgotten where she was. But it wasn't to be."
The Foreign Office said that a British person was missing and it was investigating the latest reports.
Article Source KBG Test Blog (http://rc.kbg.me)
