Help with reference pass in C ++?

Hi, I'm "doing" a game like practice ... I need to pass by reference a player data type to a function in the enemy class, I can not directly add the "jugador.h" in "enemy.h" since it's included in another header, that's why I need to declare it by ifndef .. here the code

#ifndef JUGADOR_H
#define JUGADOR_H

class Jugador;

class Enemy

{

public:

    sf::Texture texturaEnemy;
    sf::Sprite spriteEnemy;
    sf::IntRect rectEnemy;
    sf::Clock clock, frame;
    sf::Time time;
    sf::Text vidaTexto;
    sf::Font vidaFuente;
    bool repetir = true;
    bool movimiento = true;
    int speed = 50;
    int orientacion = 0;
    int balas = 0;
    float x = 0;
    float y = 0;
    float delta;

public:
    Enemy();

    void Inicializar();
    void EnemyMovement(Jugador &jugador);
    void Movement();
    void EnemyDraw(sf::RenderWindow &window);
    void Collision(Jugador &jugador);
    void UpdateEnemy(sf::RenderWindow &window, Jugador &jugador);
};

#endif

As you can see use #ifndef to include the player class, below you will see the methods of the class enemy to which I am going by reference the type of data player &jugador , and here is where I have the problem :

    void Enemy::EnemyMovement(Jugador &jugador) {

        time = clock.restart();
        delta = time.asSeconds();

        int diferenciaX = spriteEnemy.getPosition().x - error;

        if (diferenciaX > -1 && diferenciaX < 1) {
            movimiento = true;
        }
        else {
            movimiento = false;
        }

        if (spriteEnemy.getPosition().y < error && movimiento) {
            rectEnemy.top = 0;
            spriteEnemy.setPosition(spriteEnemy.getPosition().x, spriteEnemy.getPosition().y + speed * delta);
            if (frame.getElapsedTime().asSeconds() > 0.2f) {
                Movement();
            }
        } 

at the time of writing player. I do not get the variables that I have in the player class to be able to modify them from this method ... if anyone knows please thanks