Wife is making plans to go on a date with another man. What should I do?

Ok I have trust issues. I've had my wife's facebook password for months now and I periodically check it while I'm at work to make sure she is being faithful. I have logged in and saw where she had conversations with other men but none of it was sexual or over the line. I've never mentioned it. I just logged into her facebook tonight and I saw a conversation she had with an old friend. He is a friend that I do not know and I've never heard her mention the name. It is a friendly conversation but later on, he asks her if she wants to go on a date to a certain restaurant. Apparently, they were supposed to go today but he said that he had to work late and they will go next week. He said that they can go either next Tuesday or Thursday. I looked at his pictures and I think he's in a relationship. I'm not too positive but he has several pics where he is close to another woman. What should I do? The conversation seems friendly enough but she hasn't mentioned anything to me about it. I don't mind if she has friends and goes out but from a guy's perspective, I'm thinking that he wants to get in her pants. She normally goes to work and comes home afterwards. If she goes on a date with this guy in the evening, she would have to make up an excuse to leave the house or she could just tell me the truth. Should I confront her with this or should I lay low to see what happens. She doesn't know that I have her Facebook password and she thinks that I trust her.

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