Please any help at all. They often become 2-way character assassinations. Your friend really needs the advice of a lawyer experienced in these matters. Your friend needs to talk to an attorney, if she is unable to afford private counsel, there is always the State Legal Aid office. A local attorney would be able to provide insight about the bias of the particular judge in their divorce and possible custody battle.
Most judges do indeed favor custody to the mother, esp.
However, this is not always the case. And we all know it isn't necessarily fair as far as men vs. women in the dating scene. A woman is typically viewed much more harshly over this than a man. Since there is such a potential for trouble here, I would highly recommend your friend to keep her dating life under wraps until after the divorce. Don't give him any more fuel for the fire.