the dude is not going down with raising another man's child
poor kid, though, his/her life is fucked for this, just because the mommy loved being fucked by many dudes
the moment you raise a kid for X number of years, blood relations cease to matter. you've long since committed to that. society doesn't work if men just decide "oh, i don't have any responsibilities here. it's not mine!" as if the work you put in can just be erased/forgotten
this is how you get fatherless homes/crimes/etc. If the woman was bad enough to cheat, you're still worse for not being a real man and committing to what you started. I'm not arguing he should stay married (she should be dumped to the curb) but the child you've raised is more important than anything in your life at that point. He obviously never loved his child and has no sense of social responsibility.
"alpha/beta" is irrelevant here because the real world doesn't function around a dichotomy, especially not long after the point where you've had a child
hopefully the courts force him to take responsibility. This is one aspect of society I tend to be fairly conservative on - if it was a baby that was recently born I could see his point of view, but by now, the child knows him as his dad. It's much too late to cut him off. The child matters more than his desire to be "free" of parental responsibility
why should the man bother to raise the child born from the affair of his wife. Raising another man's child doesn't make you a real man, actually just makes you a pathetic man. Real man raises his own child, not kid born from slutty mommy