My girlfriend said I looked like his ex-ex, and then said a lot about how good that person was to her ... I was so desperate after listening to it. Ask for guidance

Since you really love her, you can tolerate all her temper, think of her, urge her and be kind to her. Even if she occasionally resents and says something slightly hurtful, I think I can tolerate it with my heart. Then you can tolerate her past. Now that you are together, you are lovers. You should try to maintain your love, not doubt it. If she says "you are like him" again, then you say "but I will love you more and do better than him!" In short, let her have confidence in you. That man is fine and still looking for her. You should take some measures to occupy her time more. Trust her and let her handle it herself. Personally, I think it is much better than the person you are looking for.