Was my ex boyfriend jealous I messaged his friend?

So he dumped me. He still has feelings for me from what I know but life got in the way so he dumped me. I don't message him anymore. I messaged his close friend maybe 1-2 WEEKS ago. Only once. Nothing flirty. Today he just brought it up. He said "don't ever message me or my friends b*tch. I know you messaged (friends name)." I said "I know. I'm sorry" he blocked me. Unblocked me hours later and said "I'm sorry for saying that. Just please don't message my friends or me." I only messaged his friend one time, week (s) ago. Why bring it up now?"
Yes he was jealous
Vote A
No
Vote B
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GirlGuy
Updates:
+1 y
Update - he got jealous easily when we were together
+1 y
Another update: I apologized for messaging his friend (about him) and he said "its fine whatever"
Was my ex boyfriend jealous I messaged his friend?
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