You can go back earlier than Yaakov. In Chayei Sarah, Yitzchok saw Rivkah and it sais “he loved her.”
True, but actually the Torah teaches us a very different and more important lesson about marriage from Yitzchak and Rivkah. The Torah states that he loved her, AFTER he had married her and brought her to his mother’s tent (Breishis Perek 24 Posuk 67). The specificity of his loving her AFTER it says he took her as his wife, which is the reverse order that most of us thing of in getting married (“first comes love, then comes marriage…”) has most meforshim stating that this is to show that the love is most important when it FOLLOWS the marriage and is developed and nurtured for a lifetime commitment.