Why is my ex befriending one of my friends on fb?



I have a gay guy friend who happens to be one of my closest friends. My ex met him because of me. Recently, after the breakup. When i blocked him on fb a year after the breakup. He decided to request my friend on fb and start convo (on politics). He's been requesting my friend 5 times. After my friend accepts and deletes or blocks him. My ex is dating someone so...

The 5th time (recent, 1 year 4 months after) my friend decided to find out why
he was like "hey you should text me if you want to talk rather than messaging."
ex: i dont have much to talk about. I just want to keep you as a facebook friend.

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+1 y
This the 5th time my ex has requested my best guy friend on fb, why?
Why is my ex befriending one of my friends on fb?
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