Well let us not condemn Emily of being trailer trash or such. At least from Andreas looking back upon that relationship you could not really blame him if he felt he was and always has been her at best second choice and only in the picture cause Emily had a child and needed a father and possibly an extra income. Whether he is right or not, only Emily knows for sure though
Edit: To be fair though and what most people now shitting on Emily seem to forget is the fact our MC suffered two trauma's. the first trauma was the divorce because he had in his eyes a perfect childhood with loving parents. Now that is not a description I would expect if Emily had not cared for Andres and had only been with him for the kid or money.
So it looks that Andres may well have won over time what he wanted most and due to his own issues and a stupid move from Emily lost it all.