I agree with the others that once is too much. I'm certain that if you are in that situation it is easy to make excuses for your partner. However, these situations don' fix themselves. You must take chage of your destiny.

What do you mean by "saying it's you fault"? It's never you fault if someone hits you. However, people who hit often manipulate their partners to make them feel as if it's their fault. Please try to see this for what it is. Don't let it undermine your self confidence and always remember that you deserve to be treated better than this. There is help and support out there for you.

I'm affraid there is only one solution to your problem and that's to head for the door in the safest way possible. However, I think you realise this and are trying to summon up the strength you need. It may be the best thing you ever do.

I hope you are ok and safe. I wish you well.