Why would he delete our chats on telegram?

I have a friend who I like and he actually gives me mixed signals, and this time he deleted our messages on Telegram. I was the one who sent him the last message, and he did not open it for several days. Then I noticed that he deleted all the conversations between us, knowing that there is a feature of deleting the messages for only him, but he deleted it for both sides. I don't know why he did that

Why would he delete our chats on telegram?
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