Am I wrong?? Need advice

Due to all our problems (over the yrs) stemming from one problem and one problem only = my partner + alcohol, I have FINALLY put my foot down & gave him an ultimatum alcohol OR family, not both . he has quit drinking for the past 2 or so months . This weekend there’s a wedding happening, he says were invited but didn’t even know it was this weekend 🤷🏽‍♀️ & he has already ‘told me’ that because it’s his family he will have to drink if they tell him too blah blah, which I find BS considering I’m the one who is with him & does it all for him and he hardly see’s his family, and I’ve found out today my kids and I will be out of town for the weekend so won’t even be there. Anyone know how I should go about this if he does end up drinking? Am I wrong to not let him drink for his auntys wedding? I gave him 1 more chance so if he breaks this I need him to know I’m very serious. In a way I want to not say a word & see if he breaks his promise (like every other time) but on the other hand I want to drill it into his head that if he drinks we are done . 6 years full of broken promises & ‘mistakes’ by him, I will not be putting up with anymore .