Why is my ex boyfriend acting as if I broke his heart?

So it’s been little over two weeks since he broke up with me because he said he stopped loving me. But now all of the sudden he’s been posting crazy stuff on his stories(he isn’t the type of person that would post anything) an example, he posted a pic of a dog and said “My only hot blonde for Halloween” I felt like being petty and replying back to it but didn’t. Like why is he acting as if I broke up with him, he made all of his mates and girl mates unfollow me like god knows what he’s been saying. If you’ve an issue like talk to me. I honestly don’t get what he wants. I don’t know if I should break no contact.