Drowning in a sea of confusion

A while ago, I discovered my wife had been developing a relationship with a male co-worker that I felt had gone too far. I found a text where she told him she was glad my (medical) test results were clear, as she thought karma would punish her for her "unruly affection." I found other evidence as well that indicated something had been going on. I confronted her, and she admitted that they had been flirting, and that it was inappropriate, but said that nothing had happened (despite the fact they spend a lot of time alone together.) She said that it was her fault (he is newly married) and gave explanations that I accepted. 1 week after she is supposed have made the relationship business only, I find an email from her to him that said: "You know in E. T. when Elliot and E.T. have to say goodbye and E.T. holds his finger to his own heart and says "Ouch," well that's how I feel. I hope the aching stops soon, it hurts." To me, this seems to suggest she had real feelings for him beyond just liking the attention and flirting (which is what she said was all that was going on,) but I have lost all objectivity. I need a second opinion. Please help.

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