My friend of 10+ years just unfriended and blocked me

I don’t know why this year has been so shit for me. First the job market practically chewed me up and spit me out, my grandma passes away not even two hours after I left, my relationship with my mom is down in the gutter, and now this? I woke up and see one of my oldest friends just left all the group chats and unfriended me and essentially blocked me and I don’t even know why. All I know was that they got into a petty argument with another friend and suddenly they’re cutting me off. Maybe I saw this coming, our friendship was heading south but I still clung to it since I already had so few friends. But not even a single word to me to tell me why? Did I annoy them that much? I always had a feeling but for it to actually come true… I already felt shitty about myself the other day but this has just sent me into a spiral where I’m frantically trying to contact my other friends to check if we’re ok but now I’m worried about annoying them too. I just don’t want to be alone.