I don't understand this point bro you said if she had told you she had boyfriend and left him and you will be happily get married with her !!
No offense bro in your entire thread I didn't realize that u are such big heart boy and if she had told you u will get marry her! U are just trying to be Great by saying them!
I don't see her fault in those thing (sex with ex bf, watching porn). I don't know about other thing but nepal has quiet developed in this field so its not a big point I guess and she might have lied because she don't want to leave american green card holder like you ! Put urself in her position and put ur hands in ur heart and say would u tell the guy that u are not virgin and had bf in past !! No way bro !
Get life , forget past live in present ! Think about leaving her if she still continue to lie you( not about past, in present and future stuff) ! But as I think bro if u leave her for such a crap reason u willll never be happy in life , who know ur next wife be like her !!