What I do after a Break up?

I just broke up with my girlfriend that i was about to propose to her to be my wife, she broke my heart, and now I am just being a fu*kboy all the time and spend too much time se*ting and watching **** to move on, but i feel like I am harming myself., I really don't know what to do, I even beg her but she said that she lost all her feelings from me because I was mad at her.
What I do after a Break up?
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