Was she using the “it’s not you, it’s me”

She me left saying “I don’t know if I will talk to you anymore because I only make you mad. I want to make you happy but I don’t know how. I’m not enough. You deserve better. You’re out of my league. Sorry for everything.” I asked her if she was gone forever and she said “I don’t know, I don’t want to leave you but I just don’t know how to make you happy anymore.” She then unfriended me.

To me it sounds like she’s saying I have anger issues and get mad at a lot of what she says which I agree with, but it sounds like she’s trying to make it about herself and not me. Where in the hell does that “you’re out of my league/ You deserve better” come from?

TL;DR My girlfriend broke up with me due to my anger issues that manifest from my depression. Does it sound like she’s using the “it’s not you, it’s me”?