Can a Man Stay with his Wife After She's Been With Another Man?!?!

My wife and I came to an eruption after I find that she was intimate with some guy and was having an emotional affair. She swore they didn't have sex, and I talked to the other guy too and he said the same thing. You can read about that here if you wish... My Wife Has Feelings for Another Man and it is Eating Me Up!!! ...Anyhow I just have to believe them if I want my marriage...which I do. So I ask my wife if there was anyone else she was intimate with before this incident. She says "no, but I have flirted with some people". I accepted it but here is the nagging thing. Later on she gets a call from an old acquaintance, some call a "cut buddy". Now we've been together over 5 years, so why would a guy who their only function was to phuck each other (when she was single) be still calling her? So I ask her again but she swears they would just talk casually as they were both married now. Well, her being married didn't stop her from cheating last time, so uhm...what the hell is that supposed to mean? For the most part she is acting the part of a model wife. We are connected in all ways and to my knowledge she has respected the boundaries I have imposed on her. I feel like if I start digging some more it will mess things up, but at the same time my gut tells me I don't know everything and she will probably keep lying/denying in fear I will ask for a divorce. What should I do? How to deal? I want to trust my wife and just move on, but I can't do that if I don't feel like she is being completely open and honest with me. At the same time I need to come to terms with the state of our marriage, which includes whether or not she's been stepping out this entire time...

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