IMO you did the right thing, you can't change him, he needs to change him. Further, he should work on learning how to live happily sober and single first, then work on a developing a healthy relationship. I also wouldn't put too much thought into the length of your relationships when it comes to this one, no need beating yourself up over his problem. He is just deflecting his problem back to you trying to make it seem like you are the one with a problem.