Why did he block me?

He's my ex but we are good friends. We would talk on the phone once a day... I called him this morning and we had a great conversation. He mentioned that I didn't call him last night. I told him that I was tired. So today he call me around 5pm and I missed his call, I was in the shower. I called him back and he block my number, he also block me on his Facebook. That really hurt me because everything was going good. I feel like getting one of those text now numbers and call him... or make a Facebook account... I'm confused. I didn't do anything to him...

Why did he block me?
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