Girlfriend broke up with me and itts evident she has started seeing someone else. I need help?

[Elsewhere]

You already answered your own question, you need to accept that it's over and move on. Nobody claims this will happen overnight, and you aren't in competition with her to see who moves on first. You need to keep ignoring and avoiding her. Focus on other things and stay busy. Don't try to date yet, it's obvious you aren't ready and it's not fair to the new girls you meet. Your feelings for her will fade with time, but you have to make a concentrated effort to move forward and not dwell on the past.