Not to screw your wife over (though she deserves it). Not to show you've got a pair.
Do The Right Thing, because your son is watching. He will learn what it is to be a man from you; everything you do.
Don't let your hurt and anger lead you to do things that you'll be unable to justify to him in 12 years, when he's on the cusp of manhood.
This isn't to say be a doormat to your wife's CB. Stand up for yourself, get fair custody, make sure you and your son are safe. And then let your W go.
You've got a long life ahead of you, you seem (as well as one can tell on the intarwebs) to be a thoughtful young man. You deserve more than your wife can give you, and you'll find it. Be strong.
