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This is a very delicate situation. Abuse is never helped by avoiding this situation or trying to resolve it yourself. You are right to assume that this is a bad example for two parents. The child learns that this behavior is acceptable and have a good chance of repeating it. You should not put off addressing this problem. The major obstacle is that your husband has to be motivated to stop this behavior and has to be open to the methods that we have available to us which is therapy. There is no way around fixing a problem by avoiding. If he is not motivated to be a different person he won't. There is self help out there but he has to want change so badly that he is willing to do whatever it takes. You can't want it for him. There are rules to fighting but abusers don't follow them. He has to face the consequences of losing his relationship however the solution comes to be. If he is trusting of another professional and willing to participate than it doesn't matter who the professional is. You can't make him change but you can give him consequences to this behavior. The choice is yours of whether you have the consequences that you need to offer to him.
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