Building a life with someone with constant progression and growth is necessary for a healthy relationship.Just because he says he loves her does not mean that he will do what it takes to prove it to her.
Finding someone to fill the void is much deeper than any feelings he has for the side chick. A lover of fine wine and food, I tend to break the bank of those who can handle me.
This in turn will make the other woman feel even more humiliated as she thought he didn’t like his wife like that.
If she expresses it, he already has his reasoning – 1) she knew he was married, and 2) he never said he was leaving his wife.
The man more than likely plays into this often times telling her things such as “I wish I could have met you years ago”.
This makes her feel as if the only thing keeping them apart is the ring on his finger.