That question, kinda is why so many fail today. What do we expect, or want out of a relationship. Expectations are dangerous. A relationship that lasts is to be 100/100 % to many want their mate to make them happy, or for sparks and fire works. when they die then so does the so called "Love" Love is a choose and a decision. It is not butterflies or emotions. I love, 1 Corinthians 13 definition of Love. Love is hard work, that can be very rewarding, but can also be heart breaking, sad, and tiresome at times.
That is the main thing I would look for. That my mate understood, God's definition of Love, and marriage. and that he has a true heart for the Lord. If so, even if an issue arises, I will have faith it can be resolved in love.