Hello,Greetings to you.I am Kashif living in Punjab Pakistan.On 12th June ,2016 I got engaged but after few months I came to know that my fiancé have affair with a boy who is living in the front of her house .one day I ask her about him but she denied . Now I am very upset because of her please tell me what to do?
Looking forward to you,
Kashif

How did you find out and how credible is that source? How did you become engaged, through family, or agreement with her? These are all important things to consider. Please share.

More questions - what do you mean by 'affair' exactly, and when was it (allegedly) in relation to when you two met?
If before you met her, forget it. I know there are still parts of the world where men feel they have a right to be possessive about a woman's past, but they are FOOLS and have a horrible double standard, because they don't think their pasts matter. She even has a right to lie about that, in my opinion, because what she really is saying is none of your business.

Bottom line when you hear a rumor:
1. You can believe it, reject it, or ask about it.
2. If you ask about it, you can believe the answer, reject it, or keep wondering....
3. If you keep wondering, as you are doing, then the marriage is doomed. What good is marrying someone you think is a liar? You will never be happy.

There is nothing more cruel and awful and stupid than a rumor. Your choice.
You are asking total strangers something that you have to deal with. You clearly don't believe her, or you wouldn't be here. Maybe you have some facts we don't have and are right, but I'm thinking that you don't. I feel for HER!