K,

It is normal for you to feel they way you are feeling. It's hard to imagine that the person you married would betray you in that way.

You can snoop to find more evidence if you want but trust me when you find more evidence it will not make you feel better.

Again a married woman doesn't go away with another man hiding everything from her husband on their first encounter.

Also, look at her actions. She's not fighting it shouting from the rooftops that she did nothing wrong.