Shruti, i for one can understand what you would have went through because i went through the same experience, except i was the one from UK and my husband was from abroad, he was already married.....
More shockingly it was MY mother who was the main culprit in this she knew full well of the background of my husband and his status, she chose to hide that from the rest of the family
You were lucky, you had your father to fight your corner, my father passed away just days after my marriage took place although i know 1000% he would have stood by me and held my hand to lead the way through this turbulent time in my life......
My husbands family had just used me from day one knowing full well about their son, all they were interested in was their son getting his visa and settling in the UK, after my father passed away they had no respect for me or my family, without going into much details i suffered greatly after that.....
In our religion (like most) divorce is taboo, it should never cross your mind, of course my mother was greatly against it she couldnt understand why i couldnt stay in an abusive marriage and paint a picture of happiness for outsiders, but i gathered my courage and stood up for myself and fought.......(family honour,, family respet etc was all i heard since day 1) iv came out of my exprience a better person, its not easy watching the person who should be your soul-mate love someone else, she may not have been in the same country but he would blatantly make phonecalls infront of me, would send money that I had earned back to her to support her, assured her time and time again that "as soon as his visa was sorted he would go back for her"......i was fortunate enough not to come face to face with her but shruti i admire you for that, she may have been the one who was abusive to you but you showed her that YOU were the bigger person by not stooping to her level, there is no respect for woman who come between a husband and wife
Now iv built my life up again and you can too, iv joined the police force and help woman who have went through the same as my self.........you may think that you are in a dark place in your life but there is light at the end of the tunnel...stay strong and make something of your life, show them your better than them and that its their loss....show this other woman that your better off without him and that her time will come one day as well because what goes around comes around, he clearly had no respect for her if he happily went ahead and married you knowing full well he was with her, if he did it once he'l do it again.......
Alot of people out there may wonder why we put ourselves through situations like this but YOU WILL NEVER KNOW UNLESS YOU'V BEEN THERE...its easy to judge...