My boyfriend is ill (he told me this in one text then went offline) and hasn't responded to my text since 3 days. I'm worried as hell. What do I do?

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We're in a long distance relationship, that's why I'm really anxious
My boyfriend is ill (he told me this in one text then went offline) and hasn't responded to my text since 3 days. I'm worried as hell. What do I do?
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