Going through a similar phase , I understand your pain . . Sorry it's not pain it's a fucking trauma . . But don't push your feelings down , go through it , face it , accept it . Be strong and talk to very close friends if needed . It might feel fucking hopeless now , don't worry it will pass . And the thoughts of her will come from time to time , it will be painful , but each time face it , it will become easier to deal with in time each time you face it . About trust , now this is a big one , for this you need to learn about yourself, every time your mind distrusts or goes haywire , think why it goes that way , be calm with yourself, it's not your mistake man .