starting my Valentine's Day bad.. 😔 venting

So yesterday my SO and I got into an argument. Just seems like we can't get on the same page anymore. He's just nod who he used to be before. So, after arguing (through text) for a while he was just distant which I understand. But when I do it he gets mad. Then at night he went to his gig so I knew he would take long to reply and just done with all the things we talked about I decided to just go to sleep. Today I woke up to his text saying he was drinking. And OMG am I pissed! First of all he has promised me so many times he will stop drinking heavily! And I'm pretty sure he's back to doing drugs as well! I'm pissed because not only that but he hasn't been working because of some problems at work! Yeah he has his gigs but it's not the same amount of money he would get at his regular job! He has 2 kids who depend on him financially! And also so many bills to pay! This has been a problem since the beginning of our relationship and even way before that. I got to admit it's not as usual as before but it's still happening and I'm so upset! Gets me so mad how he says he cares so much about his kids yet doesn't seem like it when he does this. Not only is his spending money that could be used for something else but, also putting his life in danger. I'm tired of his broken promises. He asked to see me today and honestly I don't want to. This has happened so many times already. He even got a DUI about a year ago and I feel it only helped while he was finishing the programs he had to do and such but now he's going back to how he was before. At the moment we don't life together but when we did it wasn't a great experience. I've seen him as his worst but really trusted him. I really hoped he would change but now I just don't know.