If he's here as a visitor, then visitor. If he's abroad, then Chinese national. There will only be trouble if he has done something against immigration laws, based on what you wrote, I don't see a violation. The 1-2 month stays show he never overstayed. If he leaves and comes back intending just to visit, then there's no immigrant intent , though an officer may give him a hard time for being married to a US Citizen. If he leaves and comes back on a tourist visa intending to get married, then there's immigrant intent, which makes him inadmissible.
You cannot, but you will have to tell the truth anyway.
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You need to answer truthfully. Eventually you may decide to file for his green card. If you have lied about his visits, there may be trouble for him.
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