I don't want to be the jealous type. Should I just let it go?

Hello, So I have been seeing someone for 3 months maybe a little more. After about the 3rd date we agreed to only see and go on dates with each other. It was set in stone. 1 week later the woman that I agreed to do this with goes on a date with another guy. The next day she confesses that she went on a date and could only think of me when she was out with him and just felt terrible about it. While I appreciate the honesty and straight forwardness there is always that part of me that looks back on this situation very early in the relationship. I just can't get over the fact that she chose to go out on that date after agreeing to only see me. 3 months later I am more happy than ever but just can't let go of this.s. How does someone let something like this go? I guess in the grand scheme of things it isn't that big of a deal. But it still hurt my feelings and somewhat tarnished the relationship in certain aspects very early on. Am I being too emotional here? Anyways, moving forward I confront her about it and here was her answer: "I'm sorry I did that, but I also explained to you that I was afraid of commitment, it wasn't until we decided to delete our accounts and I decided to make us in a public relationship that I felt that you were being 100% honest about not dating anyone else and I immediately did what I had to do to make sure it was only going to be me and you from that point on." "But the good that we see in each other and the similarities that we have for our future outweighs all of that. Or at least it does for me" I guess this seems legit. Anyways, this all stemmed from her going out for drinks after school with her TA and the guy that the TA dates who just so happens to be this dude. She told me about it and this is how it all started. Anyways, as we are sitting on the couch around 10 PM her phone lights up and she gets a text message from the very guy. Now I don't know what it said nor did I confront her about it. I also can't control who decides to text and call her. But part of me just can't get over this and I don't know why. We literally spend all of our free time together. We buy groceries together, spend weekends together, say our good byes every morning before the work day starts. I'm 28 and she is 26. Now he could have texted her about work who the **** knows. But what I do know is that my girlfriend is a very jealous person. I am talking like crazy jealous here. She was infuriated with me that I went on a few dates with other women before going on dates with her from the dating site we met on(not this one). Her reasoning was: "They still have your number and call you at any time.". Co-worker or not, I just get the feeling that if the tables were turned and I was the culprit then she would be infuriated with me. We will see how this all pans out. We're all insecure at times whether we want to admit it or not. Nobody is perfect. I just try to be reasonable and think out my moves before acting on impulse. If I have a problem I confront the person. Would you confront her about getting a text from that dude last night or just let it go and see if it continues?

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