Contradiction with 1 Corinthians 13:5
Song of Solomon 4:9 speaks of romantic love, which can be viewed as possessive, while 1 Corinthians 13:5 describes love as not self-seeking or easily angered.
1 Corinthians 13:5: Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil;
Contradiction with Matthew 5:28
Song of Solomon 4:9 illustrates romantic desire, which some might contrast with Jesus’ warning against lustful intent in Matthew 5:28.
Matthew 5:28: But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Contradiction with 1 John 2:15
The romantic love in Song of Solomon 4:9 might be seen as earthly and sensuous, whereas 1 John 2:15 warns against loving the world or anything in it.
1 John 2:15: Love not the world, neither the things [that are] in the world. If any man love the world, the love of the Father is not in him.