Your wife started a war, filed for divorce, lied about you and is trying to make you out to be abusive.
Some if this is fuel by the "high" of the affair.
Some of it is a character issue.
She's made this public. In some sense you have no choice.
Be wise regarding legal issues. Protect yourself and your children.
I don't know much about OM, except that he might represent a "wild", "dangerous" or passionate male figure to her. The classic bad boy. Drug-dealers may not be nice, but they sure must be interesting. Think about it, who makes TV specials about us, the boring, middle-class men who struggle to keep their marriages together? Danger and recklessness trigger attraction. He makes her feel alive again. Nice little forbidden romance, eh?
Your role has been relegated to being the stable, boring guy: working 9-5, taking care of the kids, cleaning and cooking.