<human>: Can you condense the text into a few key points?

Here's the situation:

There's this guy, let's call him Matt. Matt and I met three years ago through mutual friends.  We hung out alone once and I thought he was a nice guy, but wasn't attracted to him physically in a romantic/sexual way; when he asked me out afterwards, I told him I thought we should just stay friends.  Over the past three years we've seen each other at group parties and events and have become friends.

Fast forward to this summer when I started hanging out more with this particular group that he was also part of and I get much closer with all of them.  Then three weeks ago, Matt and I hatched a plan to surprise the rest of our friends… Details are not important, but basically we spent a lot of time alone together.  Now, I should mention that this has happened to me before (guys I am friends with are attracted to me), so my "default" response, so to speak, is to push them away/joke about it until they stop.  So when he made it clear he was still interested in me romantically/his interest had resurfaced, I sort of dealt with it the way I know how to.  

The problem, however, is that I just realized that I've become attracted to Matt. What's the problem, you ask?  I'm leaving the country within the week. I'm not interested in long distance. 

So my question is – should I even bother telling him? I feel like he has the right to know, but I also worry that it will be much more harsh to tell him that I'd like to kiss him and hold his hand and hang out with him all the time for four days and then most likely never see him again.
<bot>: I have developed feelings for a guy that has crushed on me for a while and I don't know if I should tell him before I never see him again.