The Holy Scripture clearly tells us that the combined God could not be separated by man. In the sacrament of the Holy wedding, the couple become one and form a family. People served God's grace to help them in family life. However, it is not always possible to preserve the integrity of marriage. There are parting, to which the Church is bad. If couples break up because you don't get along or partner fails to satisfy in bed, the possibility of re-wedding in the future is missing.
However, the Church descends to human weaknesses. There are regulations that indicate the restart of the wedding in some cases. But the second Church marriage permission gives only the ruling Bishop.
So remarriage for example, when the death of a spouse. The Apostle Paul says that you can marry, but it's better to be a widow or a widower. If the first family ties were destroyed because of infidelity and one side did not forgive another, it is reason to divorce. Entry into a second marriage may be permitted by the Bishop. Legal barriers to divorce can be considered as chronic alcoholism, drug addiction, mental illness, HIV and syphilis. Re the wedding may also be permissible with the blessing of the Archpastor.
In practice, there are also other cases of permission for a second marriage. But they all accepted the ruling Bishop of a diocese (particular Church). In the case of the last Church allows a man a second wedding.