I think when you apologized, your wife looked at it as a position of vulnerablity. She took advantage of the situation to try to get her way into selling the house. She is trying to manipulate you.
Read the story of Kaoru on page 140 of the Art of Seduction. I think this applies directly to your sitch.
Me:49 W: 41 Kids=D14/D14/S10 Married: 15 Together: 16 Bomb: 08/26/09 Currently: separated but in the different houses.