This makes no sense, Did I do something wrong?

So I was talking with this guy for a few months, we talked a lot, had great conversations, nothing crazy. Then he un-added me as a friend. Then a couple of months later he adds me again, acts as if nothing happened, and we continue to talk like normal. Then again! Un-friends me, adds me a couple of months later. We talked a bit, But I tried not to talk to him as much this time. He then un-adds me. AGAIN. Why is he doing this? It's getting annoying and I'm so close to blocking him forever. What's up with him?
This makes no sense, Did I do something wrong?
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