Should I confess?

I have been having a crush on a guy for more than a month. At first everything was pretty well, but then one day I tried to ask him out on a date, he said he would be down but he isn’t really looking for a relationship right now. Yesterday we met in person because I invited him to a party I was hosting (he didn’t know most people there), and seeing how he interacted with my friends (especially the ones he just met), my feelings got more intense. The main thing is I’m leaving to another city to study soon, and I feel like closure would be the only way I could go away with less stress. Therefore, I was thinking if I should confess my feelings with him with a letter (we are meeting up the day before I leave)?

Should I confess?
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