Why are some friendships so difficult?

My best friend from school is a guy, we have been through so much together and it has never been this confusing.

Since we have both become single things have gotten a little complicated, we have been a little naughty via vid call although nothing physical. We had a big chat and both decided that the friendship was too important to risk for "friends with benefits".

The problem is since that chat he seems to be getting distant, he has stopped initiating conversations, he will reply immediately if I text but I don't get any of the memes or funny jokes from him anymore like I once would. He just seems to be shutting me out and it has never been like this before. I am scared I am losing him, even though we have spoken about our friendship. What should I do?

Why are some friendships so difficult?
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