What does it mean when an ex deletes you from his Facebook?

So basically me and this guy dated for awhile and I eventually broke up with him and right after we broke up, we talked some but then got extremely distant and just completely stopped talking altogether.

Then a little after that I did a drug for the first time and somehow he found out and got super p*ssed and said he didn't want to have anything to do with me ever again. So I was like, okay whatever.

And so after I had finally gotten over him about 3 or 4 months after that whole thing, I went to his Facebook and he was still my friend and everything. Then the next day, I went to it again and he wasn't my friend anymore. Which means he had just deleted me that day. What does that mean? I'm confused, because we haven't even really talked since the whole drug thing.
What does it mean when an ex deletes you from his Facebook?
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