what would you do?!

Yes, maybe a lot of us have be cheated or cheat other, but sometimes I don’t think cheating is a always a bad thing for who be cheated, we cheating just for not let other feel uncomforable or sad, for example, ever, I lost my job , it is a very serious thing to family, my wife and child will be very sad fot this, so I give them a lia, and quick find another job, them I tell them the truth. But sometimes liar is for do bad thing,for money, foe other benefit of themselves. That is bad. Generally speaking, we should sort them into two parts, Am I right?

I would definitely take her aside and talk to her. I would not make a assumption. The situation as you saw it may not be the way you preceved it. You have been together a long time and you need to find out where she stands. Does she work in any of these places? Give her the benefit of the doubt. Put yourself in her shoes. What if she saw you in the same situation. Wouldn't you want her to talk to you first before making any conclussions. You need to be fair. If you are the jealous type this can get you into trouble. It can cause you to accuse wrongly.