My boyfriend of 3.5 years went away on a trip and I found out that on the last night of his trip he kissed someone else. What do I do?

I love him so much and he has deep rooted issues that he needs to work on, I don't want to throw away everything we have as I genuinely thought I would marry him. Can we work it out or is it worth it, looking for advice or similar experiences.

My boyfriend of 3.5 years went away on a trip and I found out that on the last night of his trip he kissed someone else. What do I do?
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