The relationship deteriorated, trust was broken and each of you are paranoid about the other getting over. Couples then each hire a lawyer, the old fashion way. The litigation only feeds off of the fear and distrust, and that is what makes a bitter divorce.
Instead HIRE a Divorce Mediator with a clinical divorce coach as part of the team. In the room, the mediator is assessing the figures for parenting plan, the finances and the future life style in which both parties and children can live successfully and therefore continue to thrive.
Source: Mediation and Counseling Blog