I want to talk about this. I know there isnt sth I can do

so there's this guy. In a forum about self-development and stuff.. Let's call him J-. He used to visit my profile back in February when he first signed up. I'm an older member there. I figured why does he visit me so often? Then all of a sudden,he sent me and said hi,so I replied,we are both from the same country. He then asked for my Facebook account so we can chat by DM. I said I dont have one,but I had an anonymous for "stalking" once in a while if it was necessary. I gave his this one. Then he said if I want to meet him in person. I was not sure because I knew almost nothing about him and I couldn't trust. We met in March-April. Can't remember exactly. Until then we also went for a coffee and studied together in library - back in June. This was the last time we saw each other. From this time on something broke in me, and I'm sure he feels the same too. As the time passes we talk less and less. Messages were never frequent but now are so rare. I dont want to change with him especially because he doesn't show interest as much I've tried .

Its sad but theres nothing i can do. I have no hope about this. Why human relationships have to end?