Sorry to hear that dude but think this way, relationship is always complex esp in arranged marriage. I wont say forget what she did to you but i would suggest you to explore the last possible escort. Pour eveything infront of her. The worst thing that might happen would be "she will be upset" if that happens it would be easier for you. It might be a mistake from her side and you know how it is. In our culture, we make a mistake once and we have to live with it whole life. So dude, please go and talk to her. listen her side of story. Like i said, we make mistakes. Think twice before you take any big steps. You can leave her
 - if she still tries to make up sth to cover her lies
 -  doesnot show any kind of remorse for what she has done with u
 - doesnot show any committment for future and be adamant on her behaviour