This question and the next one are very difficult questions to face.
Situations can vary considerably.
And no matter how thorough or meticulous we are in defining a valid marriage, new situations have a way of adding a twist we had not considered and must weigh carefully. In applying Scriptural principles to these situations, Christians have not always arrived at the same conclusions. When we face these questions in actual experience, therefore, we do best to draw from the wisdom of a spiritual brotherhood, rather than trusting personal conclusions alone. Before we look at the above question directly, we should review Jesus' definition of marriage and adultery. In God's sight when a single man marries a single woman, they are bound in marriage for life.