In regards to 'finding out whether there is someone else':
be very careful here and consider all advice that is given to you in direct regard to your situation. you have an order for protection against you...do you think it is wise to consider looking into your wife's whereabouts or business right now.
How does you worrying about that right now affect your ability to detach from your wife...or to drop the rope as we say? In your immediate future on working on your side of the fence, what difference does it make if there is or is not another person? (I'm not trying to get into a semantics debate about whether or not knowing will help or hurt your chances in the future I am only saying that while you are getting on with making YOURSELF WHOLE, what difference does it make what she is doing).
In some states this behavior or snooping / checking on her with an OFP is called STALKING...be wary that you do not give her any reason to limit your access to your children, OK.
This is not easy, I really understand that. I also understand not KNOWING exactly what is going on...you need to focus on you right now.