So now despite having supervised custody only with a Soberlink with our kids, his new baby and family seem super duper fantastic and everyone is oh so happy for them.
I think the key word there is
SEEM super-duper fantastic and happy. This man hasn’t changed into the person you always wished he’d be. This other woman doesn’t have some kind of magic powers that can change him. This act of his can only last so long before the mask falls off and reality rears its ugly head of alcoholism. The gf will in time begin to live the EXACT SAME LIFE with him as you did, probably worse as the disease progresses.
I’m sure the situation hurts you a lot today but once you reach a place where you are not envious of what SEEMS to be happy for them and you view it through the lenses of reality, you’ll have a light bulb moment and feel grateful that that is no longer the life you lead living with an alcoholic. I have a feeling that day is going to come sooner than later.