Why would he do this?

I was friends with benefits with this guy for several months. He started hinting at possibly liking me and waning more with me but i tried to make sure that he knew that I didn't view things as anything serious. Anyways one day I started to not necessarily get a bad feeling about him but I started feeling bad that I was hanging out with him so I decided to block him but I let him know that I no longer wanted to talk before I did so. I'm not sure if he saw the message because I was out of the country at the time and didn't get a response. I did see a message from him a couple weeks later that somehow came through on my apple watch but didn't respond. This all happened back in August of this past year. Well fast forward to earlier this week, he added me as a friend on facebook. I'm not too sure on how he knew my last name but i did find this a little weird especially since i did accept the add and he didn't try to message me or anything beforehand. I'm confused on why after all that, that he'd try to friend me. Any ideas or advice? And sometimes I do feel bad and kind of regret cutting me off because I did enjoy our friendship but knowing he wanted more and I'm not super open to the idea didn't sit right with me. I wouldn't want to hold him back from finding someone who feels the same as he does you know?

Why would he do this?
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