Reading this nearly brought me to tears, you sound like you’re in a very difficult situation and I have been in a similar situation (partly alcohol but mainly drugs) for about 3 years so I can completely sympathise.
It has taken a lot of strength and pain to stay in this situation for me but I have done it because I knew if we split up that the children would see him regularly and that worried me as I’ve done the same as you and made sure he’s not been under the influence when driving them around etc..
Can I ask what aspect of the situation makes you want to leave? It’s a genuine question, is it the loss of connection with your wife? Or the arguments?