Do you have an evidences saying she had an affair? If so you could directly file divorces. Those are few grounds that would ease you to file the divorce. If you are a citizen of the US or GC , then US court has jurisdiction on you. I see you have a straight forward case in Nepal’s court. Get a Viber- Skype, call directly to a lawyer in Nepal. Don’t consult on, Sajha Forum; half of time people got no clue about the cases and specific scenario. If you have caught your wife red- handed, having sex with someone then you have the upper hand, divorce should be on your favor. It’s done deal with out any property division.