Are you held responsible for your actions when drunk?

When you are drunk or high, should be held accountable for your actions? Let's say you cheat on your significant other, would the excuse "I was drunk" and "it's not my fault" do anything? Or would you let your partner slide. C thinks that it wouldn't be his fault if he were to do that but he does know it would hurt me.
Are you held responsible for your actions when drunk?
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