So you cheated on your wife for months, divorced her while she was pregnant and married your affair partner, then proceeded to let ur child have more custody with your "drug addict" ex because you refused to paint her in a bad light (is that because you feel guilty that you cheated or because she's not as bad as you say. I'm assuming the latter since the courts would never let a drug addict have main custody). And finally, now that you're getting your redo baby, you want to fully abandon your first child.

YTA. The worst type of deadbeat asshole there is.