For someone to remain single, their must be four things which involve being fully convinced in someone's mind, all found in verse 37.
Each of these things comes back to being convinced in their own mind of singleness as well as to no outside influence on the matter.
Widows are to remarry only in the Lord (only other Christians).
Practical Application
Three guiding principles: remain as you are, marry if you burn with passion, live in light of the world coming to an end for Jesus has already come (live for God.
Address our cultural context had on with grace, truth, and love.
All divorce has sin involved one way or another, by both parties or one party.
The cure for sin is always Jesus (no condemnation, no ranking of sin, no picking on sin, but we must confess and repent).
We may very well need to forgive our ex-spouse.
Remain in your current man-woman marriage.
Remarriage could be sin if it is legalized lust; if process of repentance and devoting self to God, then we follow the guiding principles.
Jesus' teaching still stands. Paul's guiding principles help to flesh it out.
If you are concerned, confused, or angry, come talk with me.