The Rules of "It's Over" (Break up Rant)

I really hate break ups; watching friends going through them or going through them myself. Inevitably someone ends up acting like a supreme a**hole. I am on day two of a break up. I have tried to be nice, tried to be civil when nice failed, and all I've gotten is a text inbox full of how horrible I was. How I never gave him enough time, how I made him feel stupid and treated him poorly. I guess I was wrong when I thought I was trying hard to be a good girlfriend. Maybe I was just not good enough. Basically I'm to the point where either I cry, sleep, or just generally feel like sh*t. I also am at the point where i really don't feel like ever trying to date ever again, and/or like I will never be able to get or keep a decent boyfriend because I am, evidently, a horrible girlfriend. It makes me really upset that he feels the need to sit there and make me feel bad. He says there's a lot of stuff he hasn't forgiven me for. Two years of my life that I wasted, and I forgave him. It just wasn't healthy for either of us. I don't know. I just feel like crap and really needed to vent. I'm tired of crying.