Ex Boyfriend sent me a friend request on Facebook after almost 4 years of not speaking to each other?

Anonymous
Ok I have not spoken to my ex boyfriend in almost four years mainly because we had an ugly break up and he was kind of an asshole towards me after we broke up (rubbing his new gf in my face, calling me names) . It was to the point I couldn't take it anymore so I ended up deleting him off of social media. Over the years I eventually moved on and I have been happily dating my current boyfriend for almost 3 years and I have been hearing through the grapevine (mutual friends) that he had moved on as well which is fine. Now today out of nowhere he sent me a friend request on Facebook which I thought was very weird because after four years I doubt we have anything to talk about. What is my ex boyfriends intentions?
Ex Boyfriend sent me a friend request on Facebook after almost 4 years of not speaking to each other?
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