Myth #1: "God has one man picked out for you to marry. You are destined to be with him, and God will guide you to him."
Good luck finding this one in the Bible. There is plenty of stuff about God's will for his people, God wanting good things for you, and God's ultimate plan. Nowhere, however, does it say that God picked out a spunky brunette whom he's waiting to spring on you at the right moment. I'm not saying that he doesn't. When it comes to God, I'm pretty careful about saying what he does or doesn't do. But I do know this—if you rely on this idea too much, your dating life will get really confusing.
Some Christians take a lot of comfort in the idea that God will do the heavy lifting when it comes to dating. God will tell them if a relationship is right, and God will end it if it's not. All they have to do is sit back and enjoy the ride. This may be the biggest excuse women/men use for being lazy in relationships, much less finding one.
German theologian Dietrich Bonhoeffer addresses this issue in a wedding sermon he wrote for his sister from a Nazi jail cell. He says that God joins the relationship between a man and a woman at the point of marriage. Before that, the couple has to take the initiative. Rather than directing the course of the relationship, God wants the couple to grow and learn how to make a commitment. Once they've done that, God increases his sustaining presence.
I'm not saying that God doesn't have a will regarding your dating life. God may, in fact, have a spunky brunette in mind, and he's steering you toward her as you read this. But the Bible does not promise that God will provide a loving relationship for you while you sit around and do nothing. But, as in all things, it's best to ask for his guidance. The Bible promises he will provide that whenever we ask. Rely on God's love, wisdom, and sustaining presence while you're dating. Though God won't do all the work for you, he'll be with you every step of the way.
The good news is that most men don't have a problem with this. Regardless of your theology on the Predestination of Girlfriends, you're probably eager to be an active participant in your dating life. This brings us to our next myth.