How long does it take to heal?

how long does it take 2 heal a broken heart? well number one, i never went out with him, he is my friend and a HUGE crush that i've known since elementary school. we didnt talk 4 like a couple months so i txt him and he totally went off on me!! so i told him 2 forget it, i dont want 2 be friends with him and he was like wateva cya. and i cant get my mind off him!!!!!! i need help cause i dont want 2 walk around with a broken heart.