Am I wrong for not telling my wife?

Okay, so there is this girl who I've trained at work for about a month. So first, I should start at the beginning. So my boss hired this girl, boom she got the job and had to undergo 2 weeks of training. At first, she seemed pretty normal. She didn't start flirting with me or anything, it was strictly platonic and professional. In her second week, we started to tell a little bit more about ourselves, to each other. Now after the first week, she would start saying stuff that was a little suspicious, but I brushed it off. Then she would start doing things similar to what my wife does. Like fixing my collar when it was out of place etc. Again I ignored it and when I felt like she was getting touchy, especially with the collar thing I took her hands off me and flashed my ring and told her that I was married. Now, on a particular day, my wife and I got into a stupid petty argument that morning before work. Now, with things like this, I don't like to go separate without knowing how my wife is feeling mentally or emotionally, especially after an argument. So we were at the table together during all that time I was trying to contact my wife to talk to her about this morning, but she wasn't picking up so I was really upset. So she then turns to me and asks me "Trouble in paradise? " I don't tell anyone what goes on between my wife, but to this day I don't know what got into me. So, I told her everything. After that, she leaned and said "If you gave me the chance, I will never treat you like that" and she kissed me. As soon as she kissed me I pushed her off me and asked her "What the hell are you doing?" and I left. We don't speak now which I don't mind at all. I keep my distance. But I'm guilty because my wife doesn't know and I hate keeping secrets from her! It's like I'm betraying her. What should I do? Should I tell her before someone else does?
Am I wrong for not telling my wife?
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