Option, not your man to another.
Or bring in another as his lover.
Trouble will be created and in Srah and Abraham, we saw two nation.

But keep this in the present times.
Many women act blinded when a child is born from this union to your friend by your man.

You gave that decision with you knowing the odds of the consequences.

Read the scriptures of Haga, Sarah, and Abraham and you get a bigger picture.
There's a story here.