You ask, "Why does he not?" Because the LORD was witness to the covenant between you and the wife of your youth, to whom you have been faithless, though she is your companion and your wife by covenant.
Has not the one God made and sustained for us the spirit of life? And what does he desire? Godly offspring. So take heed to yourselves, and let none be faithless to the wife of his youth.
"For I hate divorce, says the LORD the God of Israel, and covering one's garment with violence, says the LORD of hosts. So take heed to yourselves and do not be faithless."