Broadcast engineer Patrick Lamb, 28, was last seen at about 12:30am on December 13 after a night out in Bar Chocolate in Maidstone, Kent.
Devastated 28-year-old Natasha Morgan, a retail manager, who lives with Patrick in Greenhithe, Kent, has uploaded a minute-long video to YouTube and set up a website in a bid for Mr Lamb to come home.
She tells him: 'Pat, if you're listening, I love you so much. Please come home to me.
'I need your help with everything. I need you in my life, I need you to look after me. Please let me look after you now."
In an emotional appeal for help, Natasha's twin sister Natalie told Closer: "They planned marriage and children, they have planned their life together. She is absolutely devastated. She will not give up until he is found.
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****"Her worst fear is that he has passed away but there is no evidence to suggest this so we must fight to get him home."
His family have also put up posters all over Kent and launched a Twitter campaign with the hashtag #findpatlamb.
Got any information? Visit: http://www.abbatalk.com/pat/
**VIEW NATASHA'S EMOTIONAL VIDEO APPEAL HERE: