Moving on: A tough journey ahead

He just broke up with me because, accordiing to him, the relationship was too stressful and overwhelming for him. I had a few basic expectations-like him giving me his time when I needed it or being a bit more understanding during tough times-but those weren't met consistently.
Whenever he fell short, though, I'd say harsh things without mening to and would later apologize. He kept telling me to just let go of all the issues we had,which made communication nearly impossible since neither of us wanted to address them properly. Every fight ended with him saying breakup stuff like "find someone else," but we still had moments that felt romantic and made everything seem okay.

In our last argument, I definitely overstepped boundaries, and he called out how much pain I've caused him, even though his actions have hurt me too. But when things got real bad this time, I cried and begged him to give us another chance because being an introvert, I attach strongly to people and freak out when they leave.

Now I'm a mess-crying all day, feeling like I can't do anything, just lying around in pain. He says it's not up for discussion because he has other stuff he needs to focus on now. Any advice on how to move past this?