Solomon wrote the song of Solomon because romance rules.
Solomon expressed himself through poems all the time and I think this is another one of those times where he just needed to write about it! The finished product consisted of a series of poems that don't stand alone. Each chapter goes deeper into a story of one man and one woman from their newly budded love to a time of tested and true loyalty to one another.
Why do I think Solomon wrote The Song of Songs?
Good question, all the facts point to him being the author regardless of the elephant in the room; how in the world would Solomon write such a great love poem about true, unfailing love if he was such a player? Talk about a contrast.
Lets's look at the facts: in 1:1 it states the book is of (or to) Solomon, Also, the internal evidence of the plant and animal metaphors pointing to his authorship, the use of certain areas like Jerusalem and Tirzam point to the time when he was king, and the riches and splendor talked about in these poems reflect the wealth and customs around his era...this points to truths about the time of authorship (around 956 BC) and also who wrote it--it's good to be the king.
As I was doing my BRI, trying to find the author and reason written I faced a challenge, most of the facts pointed to Solomon being the author even though I really hated that answer. I wanted the author to be the priests of that time. I wanted them to have written it to Solomon to teach him a lesson about what true love really looked like! Ya! Cause Solomon was such a tool and I kinda don't like the guy for it. But I just couldn't find enough info to back up this theory...So, as I pondered this little conundrum I realized that I could pull my lessons from proverbs into the equation. Solomon was the wisest kid in town. He knew about things on a deeper level than most because God gave him this wisdom. His wisdom was only good when he put it into action, this is how he was such a great king; he acted upon the things he knew to be true (through God). It also says in 1 Kings that even though Solomon was blessed with great wisdom, he wasn't perfect. And what was Solomon's vise? Women.
I'm sorry, but this loop of wisdom turning to idiocracy screams ironic. Solomon knew. He knew the right thing, God gave him the wisdom to understand a beautiful romance and intimacy with one woman--that's why he wrote the Song of Songs. But sometimes even when a person knows the right thing to do, they walk away from it. They simply choose something that seems better, or maybe it was easier, or maybe his head got too big, who knows--it's good to be the king.
Whatever persuaded him to mess up shows that people are inconsistent and we tend to makes mistakes. Which means even the proof of Solomon being the author and all the theories of how to interpret the Song of Songs can be argued and persuade a person to believe anything. I'm not saying that all the interpretations of this book are correct (cause they can't all be true), but people have been opinionated for quite some time without the satisfaction of a wholesome answer. While complete agreement would be awesome, for now, I'm going to settle with the solid ground that this is a book about two people truly in love and how awesome it is to be in love.