Why did he friend me on facebook at 3am and say nothing?

This guy I dated a couple months back friended me on facebook at 3am this weekend. We dated for about a month and a half and had a great connection, but 3 months ago he found out he had to move really far away for work. We ended things in a civil way and it was sad but we both knew it'd be too hard to continue dating when he would move in May. We ran into each other once when he still lived here and said hi, but I haven't talked to or heard from him since. I was surprised to see a friend request from him. Obviously he did it while drunk, but why? Was I just on his mind? I mean we don't even have mutual friends on facebook, so he had to deliberately search me.
Why did he friend me on facebook at 3am and say nothing?
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