emitting of state doesn't seem to work the second time , flutter_bloc

Question

I am working with flutter_bloc and trying to understand how it works entirely.

I have Profile Screen. Where in the User should enter his details if previously not existed else should update the details.

Logic: If the user already exists then i fill up the textfields prior to loading , else the textfields are left blank

Problem: I have worked out of achieving the above mentioned goal , but everything seems to work only the first time , Once i save the profile and come back to the profile page it doesn't load the data and textfields are empty even if the user exists.

User_Cubit

class UserCubit extends Cubit<UserState> {
  UserCubit() : super(UserInitialState()) {
    checkIfUserExists();
  }
  void checkIfUserExists() {
    emit(UserLoadingState());
    ...
      if (userExists) {
        emit(UserExists(user));
      } else {
        emit(UserNotExists());
      }
    });
  }

Profile Screen

class _MyProfileScreenState extends State<MyProfileScreen> {
  TextEditingController? fullNameController;
  TextEditingController? mailAddressController;
  late UserCubit _userCubit;

  @override
  void initState() {
    fullNameController = TextEditingController();
    mailAddressController = TextEditingController();
    _userCubit = UserCubit(); // initializing the cubit here
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: MultiBlocListener(
          listeners: [
            BlocListener<UserCubit, UserState>(
              listener: (context, state) {
                if (state is UserExists) {
                  appUser = state.user;
                  mailAddressController!.text = appUser!.email; // Loading the fields
                  fullNameController!.text = appUser!.fullName; // Loading the fields
                }
              },
            )
          ],
          child: BlocBuilder<UserCubit, UserState>(
              builder: (context, state) {
            if (state is UserLoadingState) {
              return const Center(child: CircularProgressIndicator());
            }
            return Container(
                  TextFormField() // For fullName
                  TextFormField() // For EmailAddress
            )
       )
    );
}

Why does this functionality work only the first time not the consecutive times. Thougth the UserCubit is intialized in initstate ?

Any further suggestions to improve this logic by not initializing the UserCubit on every page render would be also appreciated !!