Why am i struggling to accept my breakup?

I’m really struggling to accept reality right now. He broke up with me yesterday after two years together and I never saw it coming. I truly believed he was my person someone I’d spend my future with. Hearing him say that I was never his shattered me.
Now I’m staying in a small room at my mom’s house and part of me keeps pretending this isn’t real. I catch myself thinking I’ll wake up go home and everything will be back to normal. I know that’s just my mind trying to cope but facing the truth feels impossible right now.
I don’t know how to feel better. I’m heartbroken overwhelmed and honestly just trying to make it through one moment at a time.