Long one, as it needs context.
Had a tough year, my dads increasing alcoholism and unstableness has resulted with him in prison, for a horrendous crime (which he denies). He’s had a history of alcoholism and possibly MH. His dad was exactly the same, bipolar which lead to addiction. He’s always been erratic, as a kid he looked like the fun dad, but it just snowballed into worry and embarrassment as I got older.
I’m now NC as of 3 months and it’s all been a massive strain on me and DPs relationship. Dad tended to lean on me, as I could never say no to him.
The issue: this week I had an impromptu works night out after a big deadline. Ive has a tough time at work (hating it) and had little sleep or food as I was busy preparing for the presentation. I got shit faced - to the point of blackouts.
DP was messaging me frequently, I missed a few as was chatting. He messaged me saying don’t walk home alone tipsy and WHERE ARE YOU?, I told him my last train. His final message was “I’m going to bed” this was an hour before my train was even departing.
It gets fuzzy from here, but it seems as though I ran off the train 4 stops early to puke. Covered myself in the process. I was obviously confused by this point as I sat on the station for a while despite there being no trains. Then I used an app to book a taxi so obviously was functioning. This took 45 minutes to come. In the meantime i waited outside the deserted station at half midnight. Drunk, covered in vomit. A kind woman drove by on their way home from work and offered me a lift, I declined. She insisted and said she couldn’t leave me there. So I got in and she took me the 20minute drive home. I can barely remember her, I’m very lucky that she was genuine. It was a very risky thing to do, I realise that.
I told all this to DP and he was livid: WHY DIDNT YOU CALL ME? And I honestly don’t know why, In my head I thought I could manage, I thought I was ok. He absolutley blew his top, said I was selfish, a stupid bitch, he hated me for putting myself in that position, it was obviously all an act of trying to punish him. And most hurtful of all he said I was just like my dad and had the [dads name] gene.
I’m petrified of turning into my dad, there’s clearly family history. I didn’t have the most healthy relationship with alcohol in my teens/twenties. I don’t think either of my parents were that great tbh, but my DM (now divorced) had been with my dad since she was 16. She didn’t seem that bothered when I told her what happened, and said that sometimes we do stupid things 
I feel so confused right now, I feel incredibly hurt by DP and I don’t know if it was justified. I have no one to get an outside opinion. AIBU to think his reaction was extreme? Or was it well deserved?