Can't deal with this feeling of regret.

Hi, I'm sorry for the rant. I'm in a bad place at the moment I guess this could be called fully justified karma. I broke up with my ex girlfriend of two years because I wasn't happy in the relationship, she loved me and I didn't appreciate fully it at the time. I was immature, foolish, had a lot to learn. After splitting up we were sleeping with each other for a few months after with her wanting to get back together but me saying I wasn't sure. She now has a new boyfriend, who she slept with whilst we were still sleeping together. I can't deal with the fact I've lost her, I've been the most stupid person on the planet and lost someone who truly cared about me. I feel like I can't justify my decision to break up with her, I miss her and I know I still love her. Every day I wake up and absolutely hate myself, I really hate myself. I sometimes punch my head and smack it against the wall because I can't stand being responsible for losing the person I've loved. When I look at myself all I see is a stupid, immature idiot. She is happy and every day I wake up I think about her with him and it breaks my heart. I don't know what to do, she must think I'm crazy but she has been supportive and patient with me, talking to me when I need it. I just don't want to be in this place anymore, I want to be happy but how can I learn to love myself if I know I'm responsible for losing the only person I've loved out of sheer inexperience and stupidity?

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