I tried setting boundaries for years that I just couldn't keep-and then slowly I learned how to-in order to protect myself and my kids. One was "I will not sleep with you / in the same bed-if you're drunk" so that pretty much meant we did not sleep together. Another one was "I will call the police on you if you are ever drunk and abusive" and my final one was "I will not live with an alcoholic as it's not healthy for me or my children". I sucked at boundaries at first and he walked all over them-and I was too afraid to actually follow through. Slowly I got it. My peace and more importantly my children's peace is most important so we are divirced. My boundary did in fact hold-I'm no longer living with an alcoholic and he is still an alcoholic. Take care and I'm sure others will be along to chime in.
Welcome, btw!! You'll find a lot if support and strength and wisdom here!