What do I do ?

I came to her I told her I was having a shit week and was feeling depressed my exact words . Want to know her response word for word ? I'll tell you I quote from the voice message."Yeah I'm just out of school there there's been shit going on so I haven't been able to talk to anyone. Yolo I have music practice and then arch club straight after so that's going to be really fun. I have arch club today,Which I'm really excited for get my mind off stuff it's a Thursday" what type of person not even friend pulls that shit I literally say I've been feeling depressed and she goes and says that. I honestly shouldn't be surprised she keeps hurting me at first I thought it was my fault I was overly sensitive but after that no it's all her. I cried after that I was crying before but that made me realise that this person who I called one of my closest friends could see me struggling who I literally told that I needed to talk to say that shit. I don't know maybe im the problem.I just hate the way I keep going back to her for comfort she is my oldest friend and I feel like I owe it to her to keep her my friend because she put up with me for so long. But I realised she didn't do anything that a normal friend would do she did less I don't know how to stop talking to her because she is closer with all my friends and I'm afraid to be alone. I can't tell anyone this because it's my fault I keep going to her even though she couldn't say it more clearly that she doesn't give a shit about me.