Why won't he tell me?

For the first time he writes he's concerned with a sad face on social media, I asked and he said he was thinking about the past. But won't specifically tell me I even called and he said it's not about us or about his past exs, just his life. I still tried to convince him to tell me but then he said it's nothing. Like wth we been open to each other since day 1 now he doesn't wanna tell me I take it personal? But he said it's not personal or he would tell me. I don't understand
Why won't he tell me?
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