Has he lied about everything? He is clearly not a medical student, his father isn't dead, he is not ill - what is real about him?
It seems like his whole life is a fantasy, and poor Emma (who is not the brightest star in the Christmas sky) has fallen for it all. Given Corrie's past form, in a month or two he will have a house, a secure job with an undisclosed but apparently unrealistic salary, a wife and maybe a baby on the way, and everyone will have forgotten his chequered past and welcomed him into the fold.
The burning (?) question is how we get from here to there without losing interest.