When you speak to his CO, you need to tell them that you want the military protection order.
If you don't know how to reach your boyfriends commander, contact the Base Personnel officer on the base where your boyfriend is stationed.
Marriage in and of itself is not considered fraternizations or misconduct, and some situations exist that may be technically defined as fraternization, but these are exceptions.
For example, the commissioning of a civilian who is married to an enlisted.
The Air Force frowns on personal relationships between officers and enlisted members, both on and off-duty.