<human>: Summarize the given text in a few sentences.

My GF and I have been together for 2 years in high school and a year in college. A co-worker kissed her after we had first gotten together. It was a mistake, I get over it. We break up before college. (In different states) We got back together recently, and had discussed the hookups that had happened while we were apart. Everything is copacetic. I found out much later that she had also gotten with the coworker right after we split up before college. She didn't tell me about it, presumably because she didn't want me to assume the worst (she had been hedging for the inevitable split) or something along those lines. I found out and dumped her immediately. Everything had been going well, and I love her very much, but I think that lying about relationship stuff in a relationship ought to be a deal-breaker. I'm pretty torn up about it and I want to be wrong. Am I?
<bot>: Found out GF omitted a certain hookup from her list of hookups she was disclosing because she thought it would hurt me or lead to lack of trust. I dumped her for it. Am I crazy?