I am a single guy and I have never experienced marriage, but the Lord has shared with me through his word on which the kind of confidence these kind of relationships should be founded. I use to be very worried that I would either never find someone that would be for me or that I would rush into a relationship that would be disasterous for me in many aspects, mentally, emotionally and above all spiritually.
There are two scriptures that I have built my confidence upon:
One is found in 1 Corinthians 4:7, "What do you have that you did not recieve?". Now think of this in a term for having specific desires in your heart like wanting to be with a man or woman in a relationship. God wouldn't give us a desire for a man or woman and then release us to go find someone on our own! Not in a million years, God has created someone for all of his children that he has planted that desire and predestined to be together with another.
The second is in Psalms 139 saying, "I am fearfully and wonderfully made." That shows me that God isn't going to do something half-way. He is going to not only provide the desire, but the person that he originally created to one day be with you as well. Let that be your confidence. That way, you won't strive to find someone in your life and worry about what kind of person they will turn out to be, just have faith in the Lord's judgement. Matthew 6:27 says, "Who of you by worrying can add a single hour to his life?"
I know saying that Mr. or Mrs. right is out there somewhere has been thrown around alot, but I am convienced by the very spirit dwelling in me that she is out there and God will bring me and her together in his timing and not mine.
Another great scripture is in 1 John 5:14-15: "This is the confidence we have in approaching God: that if we ask anything according to his will, he hears us. And if we know that he hears us in whatever we ask, we know that we have what we asked of him."