I don't know what to do?

This guy has been my friend for many years now. We were in college together but now just chat over Instagram. He sends me several pictures of himself, his day to day activities, silly memes. But the thing is, we are in different places and will probably never get to meet again IRL. It's possible but difficult considering the distance.

Whenever I mention that we should talk less or that we should not miss each other so much, he gets upset and goes silent. I have to apologize then and make him believe that everything is okay.

Has this guy started liking me? I know one day our conversations will fade but how do I make him understand without upsetting him?

I don't know what to do?
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