The Bible is clear marriage is forever. God frowns at divorce but what if a Christian's partner leaves?

Should he or she remarry?

It's complex.
The biblical God is not frowning or punished when they commit adultery with Abraham his servant ,
That God does not punish polygamy ,
In fact , Joseph and Mary were not married, lived together HOWEVER.
There are many passages in which God does not punish certain things ,
Now ,
In practice.
If you are separated could say that God does not accept that, but it is something that has happened, not only depends on you.
The biblical God also allowed promiscuity, but in other passages censorship.
Arguably, it should only sex for procreation. You do so?
How many Christians repress their sex? Many pastors and priests?
Dear friend , I know I will cite some outdated to biblical passages, but some advice:
BE HAPPY.
Do not let the eternal oppressors, who made ​​the cult of fear (and HOWEVER are the first to fall into the "temptations" wrecking his life.
God created man to be happy, not awarded the repressed bodies ,
I'm not talking about promiscuity, but to live at peace with himself.
Be happy.