It is well known that "love" in the New Testament almost always means unselfish agape love. The Greek word for sexual love or romantic love, eros, is never used at all in the New Testament. Even marital love is ideally agape love in its main expression, as in Paul's exhortation in Ephesians 5:25: "Husbands, love your wives, even as Christ also loved the church, and gave himself for it."
In the Old Testament, on the other hand, there are about a dozen different Hebrew words used for "love," and these often have wide variations in meaning, depending on context, often including romantic love as one of them. For example, Jacob's willingness to work for Laban seven years in order to obtain Rachel for his wife clearly must have involved a high degree of romantic love on his part. He also loved her sister Leah, after Laban insisted he marry her first, but "he loved also Rachel more than Leah" (Genesis 29:30).
Several different "love" words are used in the Song of Solomon, as Solomon and his bride frequently speak of their romantic love for each other. There is no doubt that God approves of such love when it is pure and true and involves self-sacrificing agape love as well. "Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge" (Hebrews 13:4). The word for "whoremonger," incidentally, is also often translated "fornicator" and can refer to any kind of sexual activity (some may call it "love," but this is a caricature) outside of monogamous, man-and-woman, lifelong marriage.
The greatest love of all, of course, in both Old and New Testaments, is God's love for the men and women He has created and redeemed. HMM