Why did my ex hit up my best friend?

My ex broke up with me couple months ago and blocked me everywhere. Couple weeks ago he unblocked me on whatsapp then two days later on Instagram, he followed my friend on Facebook the same night. Today, two weeks later he texted my friend on Facebook โ€œhey whatโ€™s up?โ€ (Side not the same night I made my Instagram account public) what is he trying to do?
Why did my ex hit up my best friend?
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