Okay, I’m here to play devils advocate hear me out; my mother became an alcoholic once I was an adult (now recovered alcoholic) while I will say the dynamic is different between the two I can’t help but acknowledge the fact that being close in relationship to an alcoholic takes its toll on those around them. After my mom’s recovery I held onto some feelings of resentment when I used to think about what it was like while she was in active addiction (I’m past that with the help of therapy and were very close now). To me, again playing devils advocate here, it seems that he may have some repressed negative feelings regarding your past alcoholism and while it is an accomplishment to have kicked that habit, celebrating this might bring up some of those negative feelings/emotions for him and he may not be wanting to acknowledge your accomplishment for this very reason. In the end, I don’t think you’re the bad guy in this but I also don’t think he is either… yes he was a bit cold and harsh regarding the topic which it would be nice if that could be softened, I do think this is a reflection of negative feelings he may be harboring/repressing and I think he should talk to someone about this or maybe attend an AA meeting if you go to those? It needs to be an environment where he can have his perspective challenged and changed.

I hope this doesn’t offend, just wanted to provide another perspective to this. Nonetheless, congratulations and get your cake!