Enslavement of the Heart

Ibn Taymiyyah (rahimahUllaah) said in Majmoo' al-Fatawaa (10/185): 

If a man is in love with a woman, even if she is permissible for him, his heart remains enslaved to her, and she can control him as she wishes, even though outwardly he appears to be her master, because he is her husband; but in fact he is her prisoner and slave, especially if she is aware of his need and love for her. In that case, she will control him like a harsh and oppressive master controls his abject slave who cannot free himself from him. Rather he is worse off than that, because enslavement of the heart is worse than enslavement of the body.