Why would your ex boyfriend call you and hang up when you answer?

My ex called me first, I answer and then he hung up on me! He did this twice and I'm just wondering..why did he do that? What is he thinking? I text him about it but he doesn't respond back..and when I called him he answerd then he hung up on me..I don't get! HELP! what's going on?
Why would your ex boyfriend call you and hang up when you answer?
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