Curiously enough, the Hebrew here could also be translated "He who stumbles upon a wife" or even "He who happens to find a wife finds a good thing." I get a mental image of a man walking along a road stopping to look down at his feet, and behold! A wife is there for him to enjoy. Whether or not that man was looking for a wife or not, the proverb does not say, however I could almost guarantee you if he is completely focused on trying to find a wife, he isn't paying attention to the road signs.
When you are so wrapped up in accomplishing your own will, you will completely miss God's will for your life and all the wonderful things he has for you. Remember it is God who gives "favor" (in wife/husband form). If God has a husband or a wife in store for you, then trust in him and follow him and he will surely lead you the right way. Focus on doing God's will first and learn to be content. You are complete in Christ just the way you are.
Do you want an easy marriage/idolatry self test? Ask yourself this question: If God told you right this second to give up (Fill in Blank:) marriage and to stay single for His kingdom, would you do it? If you answered no or had to think about it for a second, marriage is your idol.