Ms Otto described her partner's disappearance as "a complete mystery".
She previously wrote on Facebook: "How can a man walk out of a pub and not be seen since.
"Three cars drive right past the pub in the minutes after as he walks out the door. He leaves at 19.16. The third car stops briefly, could this have been you? Do you have a dash cam you could check??"
Ms Otto said: "I've been asked if there was any indication of depression or worries or troubles but I've racked my brains; there is nothing he said to me that would make me think he was in that frame of mind."
And in a direct message to her fiance, she added: "If he is watching and you're worried and you're thinking, 'Oh I can't come home, this is too big now', honestly, you don't realise how many people want you back regardless of the situation you left in - if that is the case.
"So just come home, please just come home."
Anthony is also a semi-professional footballer for Orpington FC.
His team renewed an appeal on Boxing Day to find him on
Twitter saying: "Day 6 - we will not give up. Keep sharing, keep looking and keeping hoping."
Fiancee of missing firefighter posts heartbreaking direct message to him