"You are complete. You can share yourself with others and enjoy their company, but if they leave for whatever reason, you will be OK because you have always been everything you need."
Duane Alan Hahn
God made man and woman to be "one flesh", but He took two whole and complete people. So 1+1=1 in this case. And if a couple who isn't married, just dating and broke up the equation would be 1-1=1. You are still completely whole not by the other person, but by God! We must not focus all of ourselves on another person, for if we do, we are making that person out to be an idol. And that does not show love to God and God wants our whole hearts and the best we can give Him. It's tricky though, especially when you are in a relationship, because you do have to split your attention on God and on the one you love. But the thing is to know that by loving the person you are with can be a way to show love to God. It's not making the person to be an idol or putting them on a pedestal, instead it's loving them in a way that glorifies God. God created us to be reational beings! He is a triune God, He is in relationship with Himself with God the Father, Son and Holy Spirit all in relationship with one another. And we are made in His likeness, so therefore we are relational beings. So when we have desires to be with others it is not a bad thing. But we must keep in in perspective! We cannot lose sight of the end. Everything is made to glorify God and in the end He is all that matters. It doesn't matter if we get married or not, it doesn't matter if we got good enough grades to get into grad school, it doesn't matter if our theology was perfect or not. Once we get to heaven all that's going to matter is how much we are just going to want to worship our Lord and King and do nothing else for eternity.