My cousin ignored me

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Yesterday, I talked with my cousin through phone because we are far from each other. Then we sent text messages but suddenly, he changed. I had several messages on facebook which he just read and didn't respond. I asked him why. Then he sent a messages to our group chat saying to let him alone and the other members of the group sent messages of concern to him. I told him about his messages in our group chat. Then suddenly, he sent a text message to him not to disturb him cause he missent messages because of me. One of our close cousins whom I chatted told me that they were chatting. So I sent a messages that I was told that they were chatting and he is ignoring me. After that no more, I greet him today but he never replied. Oh my God.. what happened I really don't know.