Having friends is awful, because one always ends up crying

So, I was busy, showering basically. And I didn't know my friend(we'll call her Natalie) texted me on instagram. After that, I saw her message 10-12 or less minutes later. I'm not sure how much exactly. I tried getting her attention, but she was offline. After she finally saw my messages, she said "Nevermind." I asked what happened, and she said: "Nothing". I said I was gonna literally explode as a joke, but I didn't know she was serious, and her response was "Just leave me alone". I tried, but I couldn't. I felt the need to just, know. So, I texted her apologies for being late. But she didn't even answer back, or look at them when she was online. It's ruining my health. I've been sobbing for the past few hours, and I just miss her. She's okay, atleast I hope, but I'm not. I miss you, Natalie.