I’m a terrible person

We were together for almost 2 years and I am gonna be honest I was a terrible boyfriend I never bought her anything never took her out and I was too lazy to get a job as people would say I got too comfortable in the relationship and I let everything get too far and she just let it rip and it started that we were gonna just take a break and instead we broke up because I couldn’t stop messaging our mutual friend about her and she got very mad and told me if I bother her one more time she will block me and never speak to me again. Our mutual friend still believes I have a chance to get back together with her if I can fix myself and work on the things I need to ( I know I fucked up and I know what I need to work on), I jsut honestly don’t know what to feel anymore like I want the chance to get back together but then again I don’t want any of us to move on because truthly I still love her and I can’t imagine myself with anyone else even if I have to take my entire life to fix everything. If anyone has advice about what I should/could do to not only fix the relationship but better myself not only for her but for anyone else I may meet in my life I would really appreciate it.