After Greencard

I am a us citizen living in ny. I was married in Bangladesh in 2005 in an arranged marriage. My wife migrated in march of 2008 with a permanent greencard status.

Once she came here after 3 months Ifound out that she was already involved in a relationship with her cousin before the marriage and this marriage was only a scheme to migrate here and to bring her lover/cousin who lives in kuwait but visited her while i was here and they were continuing to scheme..i felt neglected for three years not knowing why (my life was like a hell). I also found a love letters from her cousin-lover. i have reason to believe she was impregnated before coming here as well because back in bangladesh be4 u get ur visa u have to see a doctor and they give a injection of some sort which prevents u from being pregnant and she told me this but soon after she came shecame (2weeks) she took a pregnancy test and was pregnant i took her to doc some doc said she already was pregnant be4 she came but she swore to me its mine.. I asked her what she wanted. She told me she doesn't want to continue our marriage and left to Bangladesh. After 1 month she came back here to live with her uncle.Also her entire family was in on this scheme and all the love they showed me was a fake even more the love she showed me im a fool but it still hurts...

i am heart broken to be honest don't feel like doing anything at the same time do not know what to do with this situation.. if anyone out there knows or can help me through this, i will always pray for u and will appreciate greatly...
Please help.
i have not divorced her yet, and i know this is a fraud but do not know what can be or what to do about it.....

any and all help will be greatly appreciated..i hope i made some sense as this is too much drama in my life enough to cause me to lose my job becuase just dont have the strength to do anything.......