Worried and anxious for nothing. Why do people do this?

I've been worried about someone who's very important to me and the only person i have in my life, for the past 2 days I've been spamming asking if they are okay bc thats not something they usually do. I've been worried, i cried, I felt anxious for not hearing anything about them and in the end... i see them posting them being happy with friends partying.

That's an amazing friend, someone who make anxious and worried when they could have just said they wanted space or they were busy
Worried and anxious for nothing. Why do people do this?
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