OH my gosh, Tammi... I am so, so sorry for all that your son, you and everyone have had to endure.
It sounds to me that the new wife was very frightened by it all and perhaps afraid that if she stuck around, it would happen to her, too... who knows what could have gone through her mind to leave the man she just married. How horribly sad for you all. My heart goes out to your son.

Gentle hugs for your heart.