I’m having an hard night

Mentally and financially , my mental health is really bad tonight , I don’t understand why as I’ve had 10 hours sleep also an new girl has became very friendly with my best friend and I’m hoping my best friend doesn’t pick her over me. I’m really scared because people keep leaving me every time I get close to them 💔 I’m nearly crying and I’m trying to hold it in. Also , I’ve injured my back AGAIN in the same place and it’s the third time it’s happened in the last two months. Right now I’m sat by myself because she’s been talking to her for almost an hour. I don’t care how many friends people have , I just don’t want to be left for someone else , or be left for any reason , or be replaced or have an connection weaken , I hate that so much and I’m trying to hold it together because I’m always scared people will leave me.