You have probably seen the signs of cheating in your wife. Did your wife change her behavior around her cell phone? Do you think your wife goes places but do not tell you the truth about where she is going?
I am sorry you have to go through this.
That is a hard thing to deal with. Think about this for a second, do you want to find out or do you want to save your relationship? Do you want to be right or happy...
Those are hard questions to ask yourself.
Believe me I am very much against cheating, but this is about you and your happiness. Your choice.
If you want to save your relationship check out this video - Magic of Making Up