Am I overreacting?

Maegan
Me and my boyfriend have been serious about each other since about June of 2014, I was in a bad relationship before him so I have really bad trust issues which I have been working on since me and my current boyfriend got together. He just told me that back in July he kissed another girl at his college orientation.. All of the trust I built up feel like it's just been torn down. I'm so hurt. Now I can't help but think about whether they hang out at school, do they have classes together.. And stuff like that. I feel like he just pushed reset on my trust button. I kinda feel like maybe I'm overreacting over a kiss.. Am I? 

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