i rather enjoy your use of repetition in this piece. It gives the poem an interesting rhythm that, I believe, can be toyed with in future edits. The foundation of this poem is good, and it's one we can all relate too.
However, id like to address the most important issue with this poem, and that is that the poem creates more questions that answers. I will jot a few that I had while reading below:
1) What night was it? I know that the description says that it's a date, but without that, the poem gives us no context.
2) The running line "the way she knew herself...was dangerous to those" doesn't quite work. As I said, I enjoy the repetition, but the first line needs a solid stop and the second needs a cleaner beginning.
3) Why was she dangerous?
4) Why did she fall for him?
5) Why was that night unforgettable.
The issue here is vagueness. There isn't anything concrete about the writing. The only detail we are given is that it was misty. Otherwise, I can't see or imagine any of it. The greatest tool you have in your Box is imagery. Use it. Tell us why the night was innocent, tell us about this girl's crush, give us the details of why she is dangerous (this has me very intrigued). If you answer the questions above, clearly, your will have a much stronger poem in the end.