My boyfriend went on a date behind my back. What should I do?

Anonymous
My boyfriend (25M) and I (23F) have been dating for a little over 2 years now. We agreed to be exclusive with each other. Last year I was still in college and I moved home with my parents for the summer to earn money for living expenses for my last semester of college. My parents live about 4 hours away from my college town where my boyfriend lives. Last night my boyfriend told me that he went on a date with a girl from his high school he used to be interested in during the summer I went home. He told me he was curious, and lonely so he went for it. They ended up kissing but did not sleep together. He says that he has been guilty ever since and that the date gave him clarity. He says he wants to be with me and eventually marry me. He says that was the only time that he’s ever done that and I believe him. He says he’s stopped talking to her and that he has only been focused on our relationship ever since.
However, I feel disrespected. He waited till almost a year after that date happened to tell me. He acted like nothing happened and it scares me how well he hid it and how ignorant of the situation I was. Before he told me this I was 100% certain that he was the one for me. The one I will marry one day. Should I trust him and his word? Should I still pursue to work on our relationship? Should I forgive him?
My boyfriend went on a date behind my back. What should I do?
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