Am I married to an alcoholic?

I’m married to a great guy. He’s a hard worker, makes great money, good father. We have three young children, life is good.

My husband rarely drinks, maybe 2-4 times a year. When he does drink, he switches into a different person. He’s like Dr. Jakyll and Mr. Hyde. Angry, yelling, cussing......especially towards me. He didn’t drink for a few years because he said alcohol didn’t work for him. It’s steadily gotten worse. I’m at a loss. Do I stay because he’s great 99% of the time? Or do I leave because of the times he drinks? I will add he’s never put his hands on me in any way. That would be immediate grounds for divorce.