How to get my best friends back?

[Someone]

I have never been this depressed. I've literally stopped eating. I've only taken a few sips of water. I've been sleeping all day. I can't even remember much of what happened today. I'm so weak. I feel numb. All I want to do is die. I'm considering it and I need to stop, but I feel awful. This is the worst I have ever felt. I just want this feeling to go away.
I don't even know how to start, but both of my best friends are mad at me, and I don't know what to do. They have been tweeting about me, saying, "You screwed up everything," things like that. But I don't know how or what I did. One of my best friends, (I don't want to use the real name) Tina, had been acting weird latley so I asked her what was wrong and I sent her a long paragraph about how I felt like we were drifting. She didn't say much, but it was enough to make me think. She said, "I wish I could tell you.. I know we are drifting. There's a reason though and I can't say cause I made a promise. I'm not gonna break that this time." More was said, and I said that not telling me was completely fine. But I know that someone told her something. I asked her if anyone had told her anything and she said, "I'm just assuming." But if you only assumed, why would you get so worked up about it if you didn't know? She asked me so many questions like, "Tell me the truth, have you ever called me a bad name?" Things like that. I told her no, I don't recall calling you a bad name. But then I thought about it for a second. I had called her bad names. But in the past when she was making me mad. I didn't tell her though. I don't know how.
My other friend, Linda (once again, not using the real name), was acting fine and happy with me. We run at a park every Sunday (or we try to), and this time she said, "I don't know if I can go any more :/". The way she was texting was not the way she usually texts. I asked her, "How come though?" She said, "Nana and Poppy (her grandparents) are taking me and Patton somewhere cause they're coming in town for his birthday dinner." We run in the morning, so why couldn't she run and then go like she ran and then went to a concert? It was confusing. I went on Twitter, and I saw she tweeted something. She said, "You think you know someone who would never say anything about you, and then they go on your biggest insecurity." Then I realized she was mad at me. But I don't remember talking bad about her, especially about her insecurities. So I texted her. I said, "Are you okay? I saw your tweet." She said, "Yeah I'm okay.. I've just heard things I wish I never heard tonight" and I asked what they were. She said, "It's fine it was nothing worth repeating just things that I never expected to hear. I said I was sorry and she said it was okay. I told her if there's anything I could do let me know and she said she would and said thank you, so I said you're welcome, and that was it. Nothing else. She didn't reply. I went on Twitter and her and Tina were both tweeting and favoriting the tweets about me. But I still don't know what I did.
All of this makes me want to end my life. I don't know how to fix it. They are two of the most important things in my life. I love them no matter what. I know they both talked bad about me and called me names in the past, but I left it alone. I didn't confront them about anything. I just don't know how to say sorry for something I don't know what I did. But all I'm asking is for advice and to help me and how to appologize. Thank you.