I dont know what I want, should I get back with her or not?

I had a girlfriend for 7 months. During the 7th, I lost my patience with her. I yelled at her all the time and insulted her because she hurt me so many times. She was immature, unconscious of everything, and never spent time with me. We couldnt even talk on the phone! I broke up with her because one day she was really depressed. She came home happy about her new summer program. She never planned a day to hang out with me but shes so excited to something she "planned" to go to. It broke my heart so i broke up with her, because I didnt make her happy anymore. Its been a month and I dont know if i miss her or do i just need someone. This is my first girlfriend, what do i do?