Is my ex boyfriend stalking me on social media?

So me and my ex boyfriend (of 2 years) broke up over 1 week ago
Im still heartbroken about it

But I blocked him on everything - facebook, instagram, whatsapp, number

So then I wrote this caption on my facebook (picture 1)
"im selfish... etc"

Then my friend (who still has my ex boyfriend on his social media) showed me he wrote this caption few days later (picture 2)
"Life is too short... etc"

Does that mean my ex was stalking me on fb?
He knows I like that song
And I wrote that caption "thank u next" first and then I found out he wrote it too
Is that a coincidence?
He hated that song too
Wtf
Is my ex boyfriend stalking me on social media?
Is my ex boyfriend stalking me on social media?
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Is my ex boyfriend stalking me on social media?
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