Hi Daniiboi,
I hope you are okay, please do not think anything to do with this is your fault, your partner has choices and they make that choice, I am in the same boat he chose it over me and his children from another relationship, that shows you how powerful it is what you are dealing with, reach out to people on here and YouTube is a great place to understand addictions, also if you look for a guy on here called Danman he is brilliant to talk to as he can give you clarity from an addicts perspective, you have a new born and 6 year old keep all your focus on you and then lovely, do not give any money as it will enable him to do it, Take care of yourself! ❤️ Xx