Hi ya
I think when children are involved you have to think about the impact witnessing this kind of behaviour and cycle has on them. I’m in a similar position and desperately trying to leave (escape). We also share a little one together. It’s impacting our child now and I feel duty bound to put them first and in doing so I am putting myself first… our child needs a functional parent even if the other parent is completely dysfunctional.
You say that he does this infrequently but later said that this is the third bender this month. One thing it might be worth thinking about is how you’d feel and deal with it if his usage increases. My partner (soon to be ex) went from recreational only when going out to using 4-5 times a week. If he had the means he’d have been using 7 days a week. It’s completely affected and changed his brain. He’s dangerous and unstable.
Another thing to think about is whether you deserve better. Be careful not to enter into a codependant dynamic in this relationship with him. He needs to take responsibility for himself. If he is unwilling to engage with help, then it will be hard for you to move forwards.