Me and my (ex)best-friend are fighting and I don't know what to do
(I'm sorry if this isn't an interesting post, but I just need some advice)
I've been best friends with this girl since we were four, that's ten years now (I'm 14(F), she's 15(F)). She moved away at a pretty young age, but we've always remained contact and had a really good bond.
Obviously, we've both changed a lot over time. I have a lot of creative hobbies, and she does a lot of sports for hobbies, mainly running.
My parents said I have to choose a sport, and since I don't like competitive team sports and I'm not flexible enough for ballet/gymnastics, I decided to start running too. I started running half a year ago, at a different running team than my best friend(since she lives in another city).
So, we were having our annual sleepover a week ago exactly, and she invited me to come running with her at a running competition that tuesday. I thought it would be fun, and said yes.
During the sleepover, she was constantly saying stuff about being faster/ more sporty than me, but I just ignored those comments because if it'll make her feel more confident she can say those things and it didn't really upset me because I'm not a sports-lover so I guess it was kind of true.
We both thought she would be way faster than me, since she's been running since she was 6 and I had only started recently. So, since the run was 4km, at the sleepover, we had agreed to run the first 2 together and split up after (so we could both go our own tempo).
The day of the run: The competition was in her town, so I went there with my mom, I saw her as soon as I arrived and we started chatting, her vibe seemed a bit off, so I asked her what was wrong, she said something about not liking big runs and I said she didn't have to worry and that it was about having fun, which we would have together.
She introduced me to two of the other girls there, and we decided to run the first 2 kilometres with 4 people instead of just me and my best friend.
The warming-up already had a weird vibe, because my best friend was constantly commenting and laughing at how I didn't know the movements of their warm-up routine, I obviously couldn't have known it since we do different warm-ups at my running team, so I just told her that.
Soon after, the run started. The first five minutes, everyone (the four of us) ran closely together at the same speed. I felt like I could run faster, so I gently encouraged the others to go faster as well, and I thought they could handle it since they had years experience.
Nobody protested, and they all agreed quickly and smiling. So, as I was saying motivating words to keep all of us going, I noticed my best friend seemed tired, so, I slowed down again so we could all run more slowly.
Soon, we hit the 2km, and split up (like intended). Or at least, I did, I ran in front of the other girls and lost them because I was slightly faster. I also made the finish a little bit faster than the rest of them.
I was waiting in the crowd, and the other two girls arrived soon after me, so we chatted and complimented each other's accomplishments. After that, I asked them where my best friend was, since I hadn't seen her arrive. They said she had to walk instead of run because she was feeling lightheaded. Soon after, my best friend came in. I didn't see/hear it because I was talking to my mom.
Then, I heard she had to go get medical care because she thought she was going to faint. I waited for her outside of the tent, obviously worried, and when she came out, she acted really distant. At the time, I thought it was just because she was feeling lightheaded, so I just gave her a hug and told her she did great.
She didn't congratulate me back, (I don't blame her, she wasn't feeling well), but the weird thing was that when I had to go home, I said goodbye to her, and she heard it but she didn't say it back.
The next morning, I texted her if she wanted to call and play videogames (we do that often). She left me on read, but since she never does that, I got worried and asked her if there was anything wrong. Then she got mad at me and said:
"Oh so now it's my mistake and I'm in the wrong?!"
I had now idea what she was talking about, so I asked her what was going on and if she was okay.
Then, she said I sounded like J, (J is her frenemy), so I asked her again what I did wrong, and she said I was guilt-tripping her by asking that.
I called her to talk to her and see if she was okay, but she didn't pick up and kept sending me angry text messages basically repeating the same thing in different words over and over again.
So, I told her she could text me when she was feeling normal again, and now she's left me on read.
I don't know what to do and what I did wrong. I think she's mad because of the running competition, but she doesn't want to tell me what I did wrong. Like this, I don't think she's going to ever stop being mad. I don't even think she wants to stop being mad.
I guess she doesn't want to be my best friend anymore, but I'm just really scared. I literally can't remember living without her since we've been friends for so long and I just feel empty.
Any advice?