Why would someone accept a facebook friend request 1 year after you sent it?

I sent a friend request to my former college professor after I graduated and didn t really expect anything in return and kinda forgot about it. Then, all of a sudden, one year later, he accepted my friend request, but his posts show that he s been on facebook numerous times between when i sent the request and when... show more I sent a friend request to my former college professor after I graduated and didn t really expect anything in return and kinda forgot about it. Then, all of a sudden, one year later, he accepted my friend request, but his posts show that he s been on facebook numerous times between when i sent the request and when he accepted it. Just thought it was odd, any ideas why someone would do that? lol
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