Still Hopeful has said what I've tried to say, and she's done a beautiful job. The only thing I'd add is that I can't see any reason to wait until next time he's got his hands around your neck. The abuse is now because the totality of the relationship includes abuse and the relationship is ongoing.
Other than that, I suggest that you work on a letter. Work on it for a few days. When you feel good about it share it with your counselor. Share it with us. Then you can decide to give it to him or not. Perhaps emailing will be a good way for you to communicate with him for a while. Particularly if you can't talk w/o the likely risk of a fight.
Get your local support group in order.
But remember that you are a fine person. You are all that you need to be. We all see a very strong and considerate woman. We see a loving woman. We see a woman getting abused. And you have options.
Please open yourself to the options and investigate them thoroughly.
