Why did he block me, unblock me, then blocked me again on Facebook?

Anonymous
So my ex and I had a rough break up, he blocked me on Facebook. Then about a month later I looked up and I was unblocked. I never added him as a friend, just pretended like I didn't know he unblocked me. Then I ended up going to a party and he was there, he talked to me first (which was surprising) and I left like 10 min later. Then about 3 days later he blocked me again? Why would he do this?
Why did he block me, unblock me, then blocked me again on Facebook?
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