Friend disappeared from facebook?

[Kayla]

So one of my best guy friends completely disappeared off from facebook. We were right in the middle of a conversation when all of a sudden I couldn't message him. I thought "That's odd, maybe it's just my internet." so I rebooted the internet and tried to send him a message but this time it wouldn't even let me attempt to send him a message so I started to worry and I went to his page which to my great surprise was no longer there. See, he'll come up in the fb searchbar but he won't come up actually on search and I can no longer message him and he doesn't come up on my fb friends chat list, so what's up with that? I mean we're great friends and we talk frequently so I don't think he'd defriend me and block me. It just doesn't make a lot of sense.