If your name is XXXXX XXXXX lease, then you have the right to joint possession of the property. If your husband refuses to permit entry, you could break in or hire a locksmith to gain access peaceably. The problem is that your access is likely to result in any number of dangerous results, especially due to the presence of the new girlfriend. If a physical altercation or other breach of the peace occurs, then you could find that you, and quite possibly your husband and the girlfriend, will each be arrested. More important, you could find yourself being seriously injured. I've seen this sort of thing occur more than once. Emotions run high, and people get hurt.
The only way to avoid such unpleasantries is to ask the court to issue specific temporary orders, so that you and your husband know where the lines are drawn.
Re the automatic restraining orders, while they probably cover this issue, the police/sheriff can't enforce them against your husband. You would have to file an order to show cause for contempt against your husband and prove that he has interfered with the status quo. All of which takes time.
BotXXXXX XXXXXne, you can bring a witness, attempt to peaceably gain access to the property, and if you are locked out, you can call the police/sheriff, who may
order your husband to step aside and allow you to enter. But, even if you gain access, you could be injured.
So, it may be better to go only so far as to get evidence that your husband is in contempt of court and violating your property rights, and then ask the court to order him to pay for your substitute housing costs, or for him and his girlfriend to vacate the premises by means of a domestic violence
Please let me know if I can be of further assistance.