The Op said that her injury resulted from DH retaliation for her hitting him. She has not indicated whether the injury was caused deliberately or accidentally. There is a big difference IMO. If deliberate, then there is real cause for concern. If accidental, I would feel more able to forgive and move on. However, either way, she needs to accept that she played a part herself, because the info she has given us, infers that whether deliberate or accidental, her injury would not have happened had she not hit her DH first. Or are we saying that she is allowed to hit him but he is not allowed to hit back? (I know that ideally he would not have hit back, but in the heat of the moment, we all do things we know we shouldn't)
If she feels she cannot stay with this man, for whatever reason, she owes it to all of them, to move on from the relationship. If I felt this bad about a relationship and felt that Dh and I could not do anything to make it work, I would have to end it, regardless of what would happen to my lovely home. My emotional well-being and that of my DC, would certainly be a much higher priority for me that the loveliness or otherwise of my home.