Kitkat,
re your comment:-
"It is the first time he has ever hit me and I believe it to be the last. I am not scared or frightened of him. The hit was a very quick punch to the nose which left no bruising but it was his words after that hurt the most".
All the above is you basically you now minimising his violent behaviours. Are you aware also that the only acceptable level of abuse within the relationship is NONE?. He crossed a line and he will undoubtedly cross it again, his actions are about wanting power and control over you.
I would also think that he himself saw violent behaviour from one or either of his own parents as a child. It also makes me wonder what you also learnt about relationships when growing up too.
"I just feel as though I'm staying with him for our children's sake at the minuete because if I leave I know it will have a massive effect on them. We do have a lovely family unit and home. I feel like a break might be the best option"
A house is but bricks and mortar and no you do not have a lovely family unit not any more anyway; he broke that by his being violence towards you, their mother.
What do you get out of this relationship now?. Answer that question to your own self honestly and leave these children out of that question as well.
What do you think your children are learning about relationships here?.
What message are you sending them by staying with him for their sake as well; its a bloody awful burden to place on any child and its no burden they should ever carry. Your only real option going forward is to leave your H. No DV course is going to help you either, infact it will likely teach him how to cover his tracks better the next time he hits you, he felt entitled to hit you and has shown no real remorse. Calling Womens Aid on 0808 2000 247, a visit to the GP to document your facial injury and legal advice are your real ways forward.
You cannot afford for them either to grow up in a violent household; they could well go onto be violent themselves or chose a violent person for a partner. You have a choice re this man, your children do not.