I want to stop feeling like this

He broke up with me two weeks ago and instantly started talking with somebody else. They went to hoco together like three days ago and my friends were telling me they were being freaky the whole time and they were with eachother the whole night and then after the dance ended he blocked me on everything and idk why I still love him and miss him and I hate myself for that. I also hate myself for literly texting him on fucking life 360 a couple hours ago practically begging for him to give me the reason why he blocked me but ofc he jus left me on seen with no response and it hurts cause I just want a reason. I wish my brain just never worked cause now I'm having heartache again and it's killing me. Why do I care so much for somone who could give less of a fuck about me :/ how can I get over him when my mind literly thinks about him 24/7