forget her and concentrate on your kid. your kid is the one that's probably in the middle here your wife is already pregnant w/ someone else's kid. who has custody right now? she's already moved on...she's got a boyfriend and pregnant (hopefully by the boyfriend). if it's not him there is even more chaos in your kids life than just you and your soon to be ex wife.

think about what you and she do and how it affects your kid. alter your life to give your kid a better, more loving one.

one more thing...don't put your kid in the middle and talk about these things in front of him and be discreet when he asks about it.

hope this helps or take it for what it's worth.