Right from the very beginning in eternity past, God had planned history with His Son having a bride, a companion that would co-reign with Him and enjoy Him forever. That is the eternal purpose of God in creating a bride for His Son.
If you read the Scripture from cover to cover, you would discover that God teaches us in a variety of different ways. Sometimes God uses powerful word pictures, sometimes He uses symbols, sometimes He uses examples of people both good and bad. Sometimes God uses a direct word, an authoritative word, sometimes He uses examples from nature, like a tree...