So you want to know the answer to the question, how to read my wife's text messages?
I am sorry you have to go through this.
Cheating or suspect cheating 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