My One True Love.

There is someone for everyone.
Everyone has their one true love.
God has made a match for each of us.

I have heard each of these statements, or something along those same lines, many times. I'm sure most of you have. Have you ever noticed, though, the specific words they always use? There is someone, one true love, a match for each of us. One person. One love in our lifetime. Now what if this is actually true? Is there really one person, and only one, in this world who was made especially for us? It is a nice thought, but at the same time, it could be quite depressing.
Let's look at both sides of this. Fate: There is someone for everyone, and no matter what happens, the two will find eachother eventually. Chance: There is someone for everyone, but they have to work to find eachother, and there is always the possibility that they just never meet, or don't see the connection. The first one gives hope, saying that no matter what you do, you can't screw this up. The second one puts a little stress on the situation, as if to say "do screw up." So which is correct?
Example, there is a boy and a girl who live in the same town, are in the same grade, and go to the same school. They even go to the same youth group, but they don't know eachother. One day she is having car trouble, and he gives her a jump, thus making a new friendship. They start talking more, and eventually he asks her out. Fate.
New example, same boy, same girl. One day she is having car trouble, and he offers to give her a jump. She thanks him and says she'll wait till her friend gets out of class. He shrugs and goes on his way, and they never speak again. Chance.
I guess the question I am getting at is, is it possible to find true love, and let it walk on by without even noticing? What if the person you were destined to be with, wasn't the one you wanted? Or even, you loved them, but they didn't feel the same? What then? Or worse, what if you find true love, and screw it up? Do you get a second chance? I guess it's just something I've been pondering. And no one will really ever know the answer.