<human>: Can you give me the gist of the text in a nutshell?

We met on a dating site designed for hookups. I found him appealing due to his hobbies and the fact that he wasn't going to be staying in my country for long (I was not looking for anything serious).

We met, got along quite well and decided to sleep with each other exclusively. As time went on we spent more time together. We shared hobbies, desires, life experiences, dreams, etc etc. Of course, this leads to getting closer to each other. 

I kept to myself about my feelings, afraid that he would not reciprocate considering how we met. We finally told each other that we really like each other. After that we spent more intimate times together and it has been fantastic. I have never felt this way about someone I have known for such a short time (3 months).

I keep telling myself to keep it all in perspective. I will meet someone else that shares the same hobbies, experiences, etc. I just have never felt so devastated about someone that I have known for such a short time and knew that he was leaving from the start. 

I am just asking if anyone has any particular advice for just enjoying the very short time we have left and how to move on. This is a completely different scenario than what I am used to. Ending a relationship because it is not the right time, rather than because of disliking the person or other typical break up scenarios. 

It is very unlikely that he will be coming back, and if he did, it would not be for years. I also do not believe in long distance relationships with no end in sight.
<bot>: initial fling turned into mutual feelings with the man leaving the country and unlikely to return. How do I move on?