It just takes time. Remind urself of all the things she did while u were dating that annoyed u or that u disliked. Make sure you unfriend her from ur social media and such too - it might seem harsh, but the less u see her (even just her username on ur discord list or whatever) the less u will think about her. You'll get over her with time. 1 reply
Hang out with friend, try new hobbies. Dont force yourself to forget someone it just gonna do the opposite. Its okay not to forget whats important is to move on and to be at peace with your decision. Take the time to know and love yourself more, see the past in bigger pictures and in more mature mind. 1 reply